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		<title>möbius doble cover</title>
		<link>http://juanmarqz.wordpress.com/2011/12/27/mobius-doble-cover/</link>
		<comments>http://juanmarqz.wordpress.com/2011/12/27/mobius-doble-cover/#comments</comments>
		<pubDate>Wed, 28 Dec 2011 02:31:07 +0000</pubDate>
		<dc:creator>juanmarqz</dc:creator>
				<category><![CDATA[math]]></category>
		<category><![CDATA[3-manifold]]></category>
		<category><![CDATA[3-manifolds]]></category>
		<category><![CDATA[topología]]></category>
		<category><![CDATA[topologie]]></category>
		<category><![CDATA[topology]]></category>
		<category><![CDATA[with boundary]]></category>

		<guid isPermaLink="false">http://juanmarqz.wordpress.com/?p=4691</guid>
		<description><![CDATA[The set is an orientable 3-manifold with boundary. In the illustration we see in orange the möbius band at and a small regular neigbourhood of her removed without her, i.e., if , then which is ? &#160; &#160; &#160; &#160; &#8230; <a href="http://juanmarqz.wordpress.com/2011/12/27/mobius-doble-cover/">Continue reading <span class="meta-nav">&#8594;</span></a><img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4691&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>The set <img src='http://s0.wp.com/latex.php?latex=E%3DM%5Cddot%7Bo%7D%5Cstackrel%7B%5Csim%7D%5Ctimes+I&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='E=M&#92;ddot{o}&#92;stackrel{&#92;sim}&#92;times I' title='E=M&#92;ddot{o}&#92;stackrel{&#92;sim}&#92;times I' class='latex' /> is an orientable 3-manifold with boundary. In the illustration we see in orange the möbius band at <img src='http://s0.wp.com/latex.php?latex=%5Cfrac%7B1%7D%7B2%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;frac{1}{2}' title='&#92;frac{1}{2}' class='latex' /> and a small regular neigbourhood of her removed without her, i.e., if <img src='http://s0.wp.com/latex.php?latex=Q%3D%7B%5Ccal%7BN%7D%7D%28M%5Cddot%7Bo%7D%5Ctimes+%5Cfrac%7B1%7D%7B2%7D%29%5Csmallsetminus+%28M%5Cddot%7Bo%7D%5Ctimes+%5Cfrac%7B1%7D%7B2%7D%29%5Csubset+E&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='Q={&#92;cal{N}}(M&#92;ddot{o}&#92;times &#92;frac{1}{2})&#92;smallsetminus (M&#92;ddot{o}&#92;times &#92;frac{1}{2})&#92;subset E' title='Q={&#92;cal{N}}(M&#92;ddot{o}&#92;times &#92;frac{1}{2})&#92;smallsetminus (M&#92;ddot{o}&#92;times &#92;frac{1}{2})&#92;subset E' class='latex' />, then which is <img src='http://s0.wp.com/latex.php?latex=E%5Csmallsetminus+Q&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='E&#92;smallsetminus Q' title='E&#92;smallsetminus Q' class='latex' />?</p>
<p><a href="http://juanmarqz.wordpress.com/2011/12/27/mobius-doble-cover/moetwiste21/" rel="attachment wp-att-4689"><img class="alignright size-medium wp-image-4689" title="doblecover" src="http://juanmarqz.files.wordpress.com/2011/12/moetwiste21.png?w=300&#038;h=210" alt="" width="300" height="210" /></a></p>
<p><a href="http://juanmarqz.wordpress.com/2011/12/27/mobius-doble-cover/moetwiste23/" rel="attachment wp-att-4698"><img class="alignright size-medium wp-image-4698" title="moetwiste23" src="http://juanmarqz.files.wordpress.com/2011/12/moetwiste23.png?w=300&#038;h=210" alt="" width="300" height="210" /></a></p>
<p><a href="http://juanmarqz.wordpress.com/?attachment_id=4702"><img class="alignright size-medium wp-image-4702" title="moetwiste36" src="http://juanmarqz.files.wordpress.com/2012/01/moetwiste36.png?w=300&#038;h=210" alt="" width="300" height="210" /></a></p>
<p><a href="http://juanmarqz.wordpress.com/?attachment_id=4709"><img class="alignright size-medium wp-image-4709" title="moetwiste38" src="http://juanmarqz.files.wordpress.com/2012/01/moetwiste38.png?w=300&#038;h=210" alt="" width="300" height="210" /></a></p>
<p>&nbsp;</p>
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<p>&nbsp;</p>
<p>&nbsp;</p>
<p>the last step is <img src='http://s0.wp.com/latex.php?latex=M%5Cddot%7Bo%7D%5Ctimes%5Cfrac%7B1%7D%7B2%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='M&#92;ddot{o}&#92;times&#92;frac{1}{2}' title='M&#92;ddot{o}&#92;times&#92;frac{1}{2}' class='latex' /> in orange, and <img src='http://s0.wp.com/latex.php?latex=M%5Cddot%7Bo%7D%5Cstackrel%7B%5Csim%7D%5Ctimes+I&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='M&#92;ddot{o}&#92;stackrel{&#92;sim}&#92;times I' title='M&#92;ddot{o}&#92;stackrel{&#92;sim}&#92;times I' class='latex' /> without <img src='http://s0.wp.com/latex.php?latex=M%5Cddot%7Bo%7D%5Cstackrel%7B%5Csim%7D%5Ctimes+%28%5Cfrac%7B1%7D%7B2%7D-%5Cvarepsilon%2C+%5Cfrac%7B1%7D%7B2%7D%2B%5Cvarepsilon%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='M&#92;ddot{o}&#92;stackrel{&#92;sim}&#92;times (&#92;frac{1}{2}-&#92;varepsilon, &#92;frac{1}{2}+&#92;varepsilon)' title='M&#92;ddot{o}&#92;stackrel{&#92;sim}&#92;times (&#92;frac{1}{2}-&#92;varepsilon, &#92;frac{1}{2}+&#92;varepsilon)' class='latex' />, for <img src='http://s0.wp.com/latex.php?latex=%5Cvarepsilon%3D%7C%5Cvarepsilon%7C%5Cto+%5Cfrac%7B1%7D%7B2%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;varepsilon=|&#92;varepsilon|&#92;to &#92;frac{1}{2}' title='&#92;varepsilon=|&#92;varepsilon|&#92;to &#92;frac{1}{2}' class='latex' /></p>
<br />Filed under: <a href='http://juanmarqz.wordpress.com/category/math/'>math</a> Tagged: <a href='http://juanmarqz.wordpress.com/tag/3-manifold/'>3-manifold</a>, <a href='http://juanmarqz.wordpress.com/tag/3-manifolds/'>3-manifolds</a>, <a href='http://juanmarqz.wordpress.com/tag/topologia/'>topología</a>, <a href='http://juanmarqz.wordpress.com/tag/topologie/'>topologie</a>, <a href='http://juanmarqz.wordpress.com/tag/topology/'>topology</a>, <a href='http://juanmarqz.wordpress.com/tag/with-boundary/'>with boundary</a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gocomments/juanmarqz.wordpress.com/4691/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/comments/juanmarqz.wordpress.com/4691/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godelicious/juanmarqz.wordpress.com/4691/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/delicious/juanmarqz.wordpress.com/4691/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gofacebook/juanmarqz.wordpress.com/4691/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/facebook/juanmarqz.wordpress.com/4691/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gotwitter/juanmarqz.wordpress.com/4691/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/twitter/juanmarqz.wordpress.com/4691/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gostumble/juanmarqz.wordpress.com/4691/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/stumble/juanmarqz.wordpress.com/4691/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godigg/juanmarqz.wordpress.com/4691/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/digg/juanmarqz.wordpress.com/4691/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/goreddit/juanmarqz.wordpress.com/4691/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/reddit/juanmarqz.wordpress.com/4691/" /></a> <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4691&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></content:encoded>
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			<media:title type="html">doblecover</media:title>
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		<title>real elementary multilinear algebra</title>
		<link>http://juanmarqz.wordpress.com/2011/11/28/elementary-multilinear-algebra/</link>
		<comments>http://juanmarqz.wordpress.com/2011/11/28/elementary-multilinear-algebra/#comments</comments>
		<pubDate>Mon, 28 Nov 2011 20:03:31 +0000</pubDate>
		<dc:creator>juanmarqz</dc:creator>
				<category><![CDATA[algebra]]></category>
		<category><![CDATA[calculus on manifolds]]></category>
		<category><![CDATA[category theory]]></category>
		<category><![CDATA[differential geometry]]></category>
		<category><![CDATA[geometry]]></category>
		<category><![CDATA[math analysis]]></category>
		<category><![CDATA[mathematics]]></category>
		<category><![CDATA[multilinear algebra]]></category>
		<category><![CDATA[topology]]></category>
		<category><![CDATA[what is math]]></category>
		<category><![CDATA[what is mathematics]]></category>
		<category><![CDATA[álgebra multilineal]]></category>
		<category><![CDATA[cucei]]></category>
		<category><![CDATA[differential forms]]></category>

		<guid isPermaLink="false">http://juanmarqz.wordpress.com/?p=4669</guid>
		<description><![CDATA[are the common algebraic-techniques  territory for today vector algebra and differential geometry. This means that ancient vectorcalculus who turns into differential forms nowadays, is &#8220;super-oversimplified&#8221; into a mathematical language to phrase some modern geometricalalgebrotopologicalanalitic-maths. Real, &#8216;cuz first you gotta get &#8230; <a href="http://juanmarqz.wordpress.com/2011/11/28/elementary-multilinear-algebra/">Continue reading <span class="meta-nav">&#8594;</span></a><img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4669&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p><strong>are the common</strong> algebraic-techniques  territory for today vector algebra and differential geometry.</p>
<p>This means that ancient vectorcalculus who turns into differential forms nowadays, is &#8220;super-oversimplified&#8221; into a mathematical language to phrase some modern geometricalalgebrotopologicalanalitic-maths.</p>
<p>Real, &#8216;cuz first you gotta get the ideas over the field <img src='http://s0.wp.com/latex.php?latex=%5Cmathbb%7BR%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;mathbb{R}' title='&#92;mathbb{R}' class='latex' />.</p>
<br />Filed under: <a href='http://juanmarqz.wordpress.com/category/algebra/'>algebra</a>, <a href='http://juanmarqz.wordpress.com/category/calculus-on-manifolds/'>calculus on manifolds</a>, <a href='http://juanmarqz.wordpress.com/category/category-theory/'>category theory</a>, <a href='http://juanmarqz.wordpress.com/category/geometry/differential-geometry/'>differential geometry</a>, <a href='http://juanmarqz.wordpress.com/category/geometry/'>geometry</a>, <a href='http://juanmarqz.wordpress.com/category/math/math-analysis/'>math analysis</a>, <a href='http://juanmarqz.wordpress.com/category/mathematics/'>mathematics</a>, <a href='http://juanmarqz.wordpress.com/category/algebra/multilinear-algebra/'>multilinear algebra</a>, <a href='http://juanmarqz.wordpress.com/category/math/maths/topology/'>topology</a>, <a href='http://juanmarqz.wordpress.com/category/what-is-math/'>what is math</a>, <a href='http://juanmarqz.wordpress.com/category/what-is-mathematics/'>what is mathematics</a> Tagged: <a href='http://juanmarqz.wordpress.com/tag/algebra/'>algebra</a>, <a href='http://juanmarqz.wordpress.com/tag/algebra-multilineal/'>álgebra multilineal</a>, <a href='http://juanmarqz.wordpress.com/tag/cucei/'>cucei</a>, <a href='http://juanmarqz.wordpress.com/tag/differential-forms/'>differential forms</a>, <a href='http://juanmarqz.wordpress.com/tag/multilinear-algebra/'>multilinear algebra</a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gocomments/juanmarqz.wordpress.com/4669/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/comments/juanmarqz.wordpress.com/4669/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godelicious/juanmarqz.wordpress.com/4669/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/delicious/juanmarqz.wordpress.com/4669/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gofacebook/juanmarqz.wordpress.com/4669/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/facebook/juanmarqz.wordpress.com/4669/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gotwitter/juanmarqz.wordpress.com/4669/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/twitter/juanmarqz.wordpress.com/4669/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gostumble/juanmarqz.wordpress.com/4669/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/stumble/juanmarqz.wordpress.com/4669/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godigg/juanmarqz.wordpress.com/4669/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/digg/juanmarqz.wordpress.com/4669/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/goreddit/juanmarqz.wordpress.com/4669/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/reddit/juanmarqz.wordpress.com/4669/" /></a> <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4669&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></content:encoded>
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		<slash:comments>2</slash:comments>
	
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		<title>función con círculos críticos en el toroide</title>
		<link>http://juanmarqz.wordpress.com/2011/11/10/funciones-con-circulos-criticos-en-el-toroide/</link>
		<comments>http://juanmarqz.wordpress.com/2011/11/10/funciones-con-circulos-criticos-en-el-toroide/#comments</comments>
		<pubDate>Thu, 10 Nov 2011 16:29:33 +0000</pubDate>
		<dc:creator>juanmarqz</dc:creator>
				<category><![CDATA[calculus on manifolds]]></category>
		<category><![CDATA[differential geometry]]></category>
		<category><![CDATA[low dimensional topology]]></category>
		<category><![CDATA[mathematics]]></category>
		<category><![CDATA[topology]]></category>
		<category><![CDATA[cucei]]></category>

		<guid isPermaLink="false">http://juanmarqz.wordpress.com/?p=4656</guid>
		<description><![CDATA[to see the example à la wiki of a function with circles as a critical sets of a  scalar field in a surface in three dimensional space:  follows&#8230; para ver un ejemplo à la wiki de una función con cercos &#8230; <a href="http://juanmarqz.wordpress.com/2011/11/10/funciones-con-circulos-criticos-en-el-toroide/">Continue reading <span class="meta-nav">&#8594;</span></a><img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4656&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>to see the example à la wiki of a function with circles as a critical sets of a  scalar field in a surface in three dimensional space:  <strong><a href="http://en.wikipedia.org/wiki/Round_function">follows&#8230;</a></strong></p>
<p>para ver un ejemplo à la wiki de una función con cercos como uns insiemi o campo escalar en una área del trosième Raum: <strong><a href="http://es.wikipedia.org/wiki/Funci%C3%B3n_circular">sigue&#8230;</a></strong></p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>actualización (15.Nov.2011):</p>
<p>añadido gráfico:</p>
<p><a href="http://juanmarqz.wordpress.com/?attachment_id=4664"><img class="alignright size-medium wp-image-4664" title="calculo en superficie en el espacio" src="http://juanmarqz.files.wordpress.com/2011/11/calculoensuperficie.jpg?w=300&#038;h=225" alt="" width="300" height="225" /></a><br />
<strong></strong></p>
<br />Filed under: <a href='http://juanmarqz.wordpress.com/category/calculus-on-manifolds/'>calculus on manifolds</a>, <a href='http://juanmarqz.wordpress.com/category/geometry/differential-geometry/'>differential geometry</a>, <a href='http://juanmarqz.wordpress.com/category/math/maths/topology/low-dimensional-topology-topology-maths-2/'>low dimensional topology</a>, <a href='http://juanmarqz.wordpress.com/category/mathematics/'>mathematics</a>, <a href='http://juanmarqz.wordpress.com/category/math/maths/topology/'>topology</a> Tagged: <a href='http://juanmarqz.wordpress.com/tag/calculus-on-manifolds/'>calculus on manifolds</a>, <a href='http://juanmarqz.wordpress.com/tag/cucei/'>cucei</a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gocomments/juanmarqz.wordpress.com/4656/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/comments/juanmarqz.wordpress.com/4656/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godelicious/juanmarqz.wordpress.com/4656/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/delicious/juanmarqz.wordpress.com/4656/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gofacebook/juanmarqz.wordpress.com/4656/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/facebook/juanmarqz.wordpress.com/4656/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gotwitter/juanmarqz.wordpress.com/4656/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/twitter/juanmarqz.wordpress.com/4656/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gostumble/juanmarqz.wordpress.com/4656/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/stumble/juanmarqz.wordpress.com/4656/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godigg/juanmarqz.wordpress.com/4656/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/digg/juanmarqz.wordpress.com/4656/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/goreddit/juanmarqz.wordpress.com/4656/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/reddit/juanmarqz.wordpress.com/4656/" /></a> <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4656&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></content:encoded>
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			<media:title type="html">calculo en superficie en el espacio</media:title>
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		<title>is it enough&#8230;</title>
		<link>http://juanmarqz.wordpress.com/2011/11/01/is-it-enough/</link>
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		<pubDate>Tue, 01 Nov 2011 20:32:41 +0000</pubDate>
		<dc:creator>juanmarqz</dc:creator>
				<category><![CDATA[algebra]]></category>
		<category><![CDATA[free group]]></category>
		<category><![CDATA[group theory]]></category>
		<category><![CDATA[mathematics]]></category>
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		<description><![CDATA[that the presentation given by determines the group ? Similar question for : , , , for the group . Other similar problems but less &#8220;difficult&#8221; are:   for    for    for    for    for    for  it &#8230; <a href="http://juanmarqz.wordpress.com/2011/11/01/is-it-enough/">Continue reading <span class="meta-nav">&#8594;</span></a><img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4601&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<blockquote><p>that the presentation given by</p></blockquote>
<p style="text-align:center;"><img src='http://s0.wp.com/latex.php?latex=%5Clangle+A%2CB%5C+%3A%5C+A%5E2%3DB%5E3%2C%5Cquad+A%5E2B%3DBA%5E2%2C%5Cquad+A%5E4%3De%2C%5Cquad+B%5E6%3De%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle A,B&#92; :&#92; A^2=B^3,&#92;quad A^2B=BA^2,&#92;quad A^4=e,&#92;quad B^6=e&#92;rangle' title='&#92;langle A,B&#92; :&#92; A^2=B^3,&#92;quad A^2B=BA^2,&#92;quad A^4=e,&#92;quad B^6=e&#92;rangle' class='latex' /></p>
<blockquote>
<p style="text-align:left;">determines the group <img src='http://s0.wp.com/latex.php?latex=SL_2%28%7B%5Cmathbb%7BZ%7D%7D%2F%7B3%5Cmathbb%7BZ%7D%7D%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='SL_2({&#92;mathbb{Z}}/{3&#92;mathbb{Z}})' title='SL_2({&#92;mathbb{Z}}/{3&#92;mathbb{Z}})' class='latex' />?</p>
</blockquote>
<p>Similar question for</p>
<p><img src='http://s0.wp.com/latex.php?latex=%5Clangle+A%2CB%2CC&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle A,B,C' title='&#92;langle A,B,C' class='latex' />:</p>
<p><img src='http://s0.wp.com/latex.php?latex=A%5E2%3DB%5E3&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='A^2=B^3' title='A^2=B^3' class='latex' />,</p>
<p><img src='http://s0.wp.com/latex.php?latex=A%5E2B%3DBA%5E2&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='A^2B=BA^2' title='A^2B=BA^2' class='latex' />,</p>
<p><img src='http://s0.wp.com/latex.php?latex=A%5E4%3DB%5E6%3D+C%5E2%3De&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='A^4=B^6= C^2=e' title='A^4=B^6= C^2=e' class='latex' />,</p>
<p><img src='http://s0.wp.com/latex.php?latex=AC%3DCA%2CBC%3DCB%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='AC=CA,BC=CB&#92;rangle' title='AC=CA,BC=CB&#92;rangle' class='latex' /></p>
<p>for the group <img src='http://s0.wp.com/latex.php?latex=GL_2%28%7B%5Cmathbb%7BZ%7D%7D%2F%7B3%5Cmathbb%7BZ%7D%7D%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='GL_2({&#92;mathbb{Z}}/{3&#92;mathbb{Z}})' title='GL_2({&#92;mathbb{Z}}/{3&#92;mathbb{Z}})' class='latex' />.</p>
<blockquote>
<p style="text-align:left;">Other similar problems but less &#8220;difficult&#8221; are:</p>
</blockquote>
<ul>
<li><img src='http://s0.wp.com/latex.php?latex=%5Clangle%5Cvarnothing%3A%5Cvarnothing%5Crangle%3D%5C%7Be%5C%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle&#92;varnothing:&#92;varnothing&#92;rangle=&#92;{e&#92;}' title='&#92;langle&#92;varnothing:&#92;varnothing&#92;rangle=&#92;{e&#92;}' class='latex' /></li>
<li><img src='http://s0.wp.com/latex.php?latex=%5Clangle+A%5C+%3A%5C+A%5E2%3De%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle A&#92; :&#92; A^2=e&#92;rangle' title='&#92;langle A&#92; :&#92; A^2=e&#92;rangle' class='latex' />  for  <img src='http://s0.wp.com/latex.php?latex=%5Cmathbb%7BZ%7D_2&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;mathbb{Z}_2' title='&#92;mathbb{Z}_2' class='latex' /></li>
<li><img src='http://s0.wp.com/latex.php?latex=%5Clangle+A%5C+%3A%5C+A%5E3%3De%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle A&#92; :&#92; A^3=e&#92;rangle' title='&#92;langle A&#92; :&#92; A^3=e&#92;rangle' class='latex' />  for  <img src='http://s0.wp.com/latex.php?latex=%5Cmathbb%7BZ%7D_3&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;mathbb{Z}_3' title='&#92;mathbb{Z}_3' class='latex' /></li>
<li><img src='http://s0.wp.com/latex.php?latex=%5Clangle+A%5C+%3A%5C+A%5E4%3De%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle A&#92; :&#92; A^4=e&#92;rangle' title='&#92;langle A&#92; :&#92; A^4=e&#92;rangle' class='latex' />  for  <img src='http://s0.wp.com/latex.php?latex=%5Cmathbb%7BZ%7D_4&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;mathbb{Z}_4' title='&#92;mathbb{Z}_4' class='latex' /></li>
<li><img src='http://s0.wp.com/latex.php?latex=%5Clangle+A%2CB%5C+%3A%5C+A%5E2%3De%2C+B%5E2%3De%2C+AB%3DBA%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle A,B&#92; :&#92; A^2=e, B^2=e, AB=BA&#92;rangle' title='&#92;langle A,B&#92; :&#92; A^2=e, B^2=e, AB=BA&#92;rangle' class='latex' />  for  <img src='http://s0.wp.com/latex.php?latex=%5Cmathbb%7BZ%7D_2%5Coplus%5Cmathbb%7BZ%7D_2&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;mathbb{Z}_2&#92;oplus&#92;mathbb{Z}_2' title='&#92;mathbb{Z}_2&#92;oplus&#92;mathbb{Z}_2' class='latex' /></li>
<li><img src='http://s0.wp.com/latex.php?latex=%5Clangle+A%2CB%5C+%3A%5C+A%5E2%3De%2C+B%5E3%3De%2C+AB%3DB%5E2A%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle A,B&#92; :&#92; A^2=e, B^3=e, AB=B^2A&#92;rangle' title='&#92;langle A,B&#92; :&#92; A^2=e, B^3=e, AB=B^2A&#92;rangle' class='latex' />  for  <img src='http://s0.wp.com/latex.php?latex=S_3&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='S_3' title='S_3' class='latex' /></li>
<li><img src='http://s0.wp.com/latex.php?latex=%5Clangle+A%2CB%5C+%3A%5C+A%5E2%3De%2C+B%5E3%3De%2C+AB%3DBA%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle A,B&#92; :&#92; A^2=e, B^3=e, AB=BA&#92;rangle' title='&#92;langle A,B&#92; :&#92; A^2=e, B^3=e, AB=BA&#92;rangle' class='latex' />  for  <img src='http://s0.wp.com/latex.php?latex=%5Cmathbb%7BZ%7D_2%5Coplus%5Cmathbb%7BZ%7D_3&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;mathbb{Z}_2&#92;oplus&#92;mathbb{Z}_3' title='&#92;mathbb{Z}_2&#92;oplus&#92;mathbb{Z}_3' class='latex' /></li>
<li><img src='http://s0.wp.com/latex.php?latex=%5Clangle+A%3A%5Cvarnothing%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle A:&#92;varnothing&#92;rangle' title='&#92;langle A:&#92;varnothing&#92;rangle' class='latex' /> it is <img src='http://s0.wp.com/latex.php?latex=%5Cmathbb%7BZ%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;mathbb{Z}' title='&#92;mathbb{Z}' class='latex' /></li>
<li><img src='http://s0.wp.com/latex.php?latex=%5Clangle+A%2CB%3AAB%3DBA%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle A,B:AB=BA&#92;rangle' title='&#92;langle A,B:AB=BA&#92;rangle' class='latex' />  is <img src='http://s0.wp.com/latex.php?latex=%5Cmathbb%7BZ%7D%5Coplus%5Cmathbb%7BZ%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;mathbb{Z}&#92;oplus&#92;mathbb{Z}' title='&#92;mathbb{Z}&#92;oplus&#92;mathbb{Z}' class='latex' /></li>
<li><img src='http://s0.wp.com/latex.php?latex=%5Clangle+A%2CB%3A%5Cvarnothing%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle A,B:&#92;varnothing&#92;rangle' title='&#92;langle A,B:&#92;varnothing&#92;rangle' class='latex' />  is <img src='http://s0.wp.com/latex.php?latex=%5Cmathbb%7BZ%7D%2A%5Cmathbb%7BZ%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;mathbb{Z}*&#92;mathbb{Z}' title='&#92;mathbb{Z}*&#92;mathbb{Z}' class='latex' />, the rank two free group</li>
<li><img src='http://s0.wp.com/latex.php?latex=%5Clangle+A%2CB%2CJ%3A%28ABA%29%5E4%3De%2CABA%3DBAB%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle A,B,J:(ABA)^4=e,ABA=BAB&#92;rangle' title='&#92;langle A,B,J:(ABA)^4=e,ABA=BAB&#92;rangle' class='latex' /> for <img src='http://s0.wp.com/latex.php?latex=SL_2%28%5Cmathbb%7BZ%7D%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='SL_2(&#92;mathbb{Z})' title='SL_2(&#92;mathbb{Z})' class='latex' /></li>
<li><img src='http://s0.wp.com/latex.php?latex=%5Clangle+A%2CB%2CJ%3A%28ABA%29%5E4%3DJ%5E2%3De%2CABA%3DBAB%2C+JAJA%3DJBJB%3De+%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle A,B,J:(ABA)^4=J^2=e,ABA=BAB, JAJA=JBJB=e &#92;rangle' title='&#92;langle A,B,J:(ABA)^4=J^2=e,ABA=BAB, JAJA=JBJB=e &#92;rangle' class='latex' /> for <img src='http://s0.wp.com/latex.php?latex=GL_2%28%5Cmathbb%7BZ%7D%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='GL_2(&#92;mathbb{Z})' title='GL_2(&#92;mathbb{Z})' class='latex' /></li>
<li><img src='http://s0.wp.com/latex.php?latex=%5Clangle+A%2CB%3AA%5E2%3DB%5E3%3De+%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle A,B:A^2=B^3=e &#92;rangle' title='&#92;langle A,B:A^2=B^3=e &#92;rangle' class='latex' /> for <img src='http://s0.wp.com/latex.php?latex=P%5C%21S%5C%21L_2%28%5Cmathbb%7BZ%7D%29%3DSL_2%28%5Cmathbb%7BZ%7D%29%2F%7B%5Cmathbb%7BZ%7D_2%7D%5Ccong%7B%5Cmathbb%7BZ%7D%7D_2%2A%7B%5Cmathbb%7BZ%7D%7D_3&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='P&#92;!S&#92;!L_2(&#92;mathbb{Z})=SL_2(&#92;mathbb{Z})/{&#92;mathbb{Z}_2}&#92;cong{&#92;mathbb{Z}}_2*{&#92;mathbb{Z}}_3' title='P&#92;!S&#92;!L_2(&#92;mathbb{Z})=SL_2(&#92;mathbb{Z})/{&#92;mathbb{Z}_2}&#92;cong{&#92;mathbb{Z}}_2*{&#92;mathbb{Z}}_3' class='latex' /></li>
<li>&#8230;</li>
<li>&#8230;</li>
<li>&#8230;</li>
<li>dare altri venti esempi</li>
</ul>
<div id="gt-res-content">
<div dir="ltr"><em><strong>Qual è il tuo preferito?</strong></em></div>
</div>
<br />Filed under: <a href='http://juanmarqz.wordpress.com/category/algebra/'>algebra</a>, <a href='http://juanmarqz.wordpress.com/category/algebra/free-group/'>free group</a>, <a href='http://juanmarqz.wordpress.com/category/algebra/group-theory/'>group theory</a>, <a href='http://juanmarqz.wordpress.com/category/mathematics/'>mathematics</a> Tagged: <a href='http://juanmarqz.wordpress.com/tag/abstract-algebra/'>abstract algebra</a>, <a href='http://juanmarqz.wordpress.com/tag/algebra/'>algebra</a>, <a href='http://juanmarqz.wordpress.com/tag/cucei-math/'>cucei math</a>, <a href='http://juanmarqz.wordpress.com/tag/du-cucei-au-monde/'>du CUCEI au monde</a>, <a href='http://juanmarqz.wordpress.com/tag/francais/'>français</a>, <a href='http://juanmarqz.wordpress.com/tag/group-theory/'>group theory</a>, <a href='http://juanmarqz.wordpress.com/tag/italian/'>italian</a>, <a href='http://juanmarqz.wordpress.com/tag/italiano/'>italiano</a>, <a href='http://juanmarqz.wordpress.com/tag/italy/'>italy</a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gocomments/juanmarqz.wordpress.com/4601/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/comments/juanmarqz.wordpress.com/4601/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godelicious/juanmarqz.wordpress.com/4601/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/delicious/juanmarqz.wordpress.com/4601/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gofacebook/juanmarqz.wordpress.com/4601/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/facebook/juanmarqz.wordpress.com/4601/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gotwitter/juanmarqz.wordpress.com/4601/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/twitter/juanmarqz.wordpress.com/4601/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gostumble/juanmarqz.wordpress.com/4601/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/stumble/juanmarqz.wordpress.com/4601/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godigg/juanmarqz.wordpress.com/4601/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/digg/juanmarqz.wordpress.com/4601/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/goreddit/juanmarqz.wordpress.com/4601/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/reddit/juanmarqz.wordpress.com/4601/" /></a> <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4601&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></content:encoded>
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		<title>actualizado:</title>
		<link>http://juanmarqz.wordpress.com/2011/10/29/actualizado/</link>
		<comments>http://juanmarqz.wordpress.com/2011/10/29/actualizado/#comments</comments>
		<pubDate>Sun, 30 Oct 2011 03:08:10 +0000</pubDate>
		<dc:creator>juanmarqz</dc:creator>
				<category><![CDATA[algebra]]></category>
		<category><![CDATA[cucei math]]></category>
		<category><![CDATA[group theory]]></category>
		<category><![CDATA[algebra moderna]]></category>
		<category><![CDATA[cucei]]></category>
		<category><![CDATA[preliminares]]></category>

		<guid isPermaLink="false">http://juanmarqz.wordpress.com/?p=4574</guid>
		<description><![CDATA[http://juanmarqz.wordpress.com/2011/10/06/problems-de-algebra-moderna-uno-i/ Uno debe acostumbrase a leer mucho, pero no será provechoso si no se practica: leer y entender. Uno no nace con esta habilidad de por sí, pero esto  sí es posible desarrollar, si le pones persistencia. Filed under: algebra, &#8230; <a href="http://juanmarqz.wordpress.com/2011/10/29/actualizado/">Continue reading <span class="meta-nav">&#8594;</span></a><img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4574&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p><a href="http://juanmarqz.wordpress.com/2011/10/06/problems-de-algebra-moderna-uno-i/">http://juanmarqz.wordpress.com/2011/10/06/problems-de-algebra-moderna-uno-i/</a></p>
<blockquote><p><em>Uno debe acostumbrase a leer mucho,</em></p>
<p><em>pero no será provechoso si no se practica: leer y entender.</em></p>
<p><em>Uno no nace con esta habilidad de por sí,<br />
</em></p>
<p><em>pero esto  sí es posible desarrollar, </em></p>
<p><em>si le pones persistencia.</em></p></blockquote>
<br />Filed under: <a href='http://juanmarqz.wordpress.com/category/algebra/'>algebra</a>, <a href='http://juanmarqz.wordpress.com/category/cucei-math/'>cucei math</a>, <a href='http://juanmarqz.wordpress.com/category/algebra/group-theory/'>group theory</a> Tagged: <a href='http://juanmarqz.wordpress.com/tag/algebra-moderna/'>algebra moderna</a>, <a href='http://juanmarqz.wordpress.com/tag/cucei/'>cucei</a>, <a href='http://juanmarqz.wordpress.com/tag/preliminares/'>preliminares</a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gocomments/juanmarqz.wordpress.com/4574/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/comments/juanmarqz.wordpress.com/4574/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godelicious/juanmarqz.wordpress.com/4574/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/delicious/juanmarqz.wordpress.com/4574/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gofacebook/juanmarqz.wordpress.com/4574/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/facebook/juanmarqz.wordpress.com/4574/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gotwitter/juanmarqz.wordpress.com/4574/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/twitter/juanmarqz.wordpress.com/4574/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gostumble/juanmarqz.wordpress.com/4574/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/stumble/juanmarqz.wordpress.com/4574/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godigg/juanmarqz.wordpress.com/4574/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/digg/juanmarqz.wordpress.com/4574/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/goreddit/juanmarqz.wordpress.com/4574/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/reddit/juanmarqz.wordpress.com/4574/" /></a> <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4574&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></content:encoded>
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		<title>SL_2(Z/3Z), aliquis ordo</title>
		<link>http://juanmarqz.wordpress.com/2011/10/20/sl_2z3z-aliquis-ordo/</link>
		<comments>http://juanmarqz.wordpress.com/2011/10/20/sl_2z3z-aliquis-ordo/#comments</comments>
		<pubDate>Thu, 20 Oct 2011 19:59:45 +0000</pubDate>
		<dc:creator>juanmarqz</dc:creator>
				<category><![CDATA[algebra]]></category>
		<category><![CDATA[cucei math]]></category>
		<category><![CDATA[math]]></category>
		<category><![CDATA[tex]]></category>
		<category><![CDATA[group theory]]></category>
		<category><![CDATA[latin]]></category>
		<category><![CDATA[SL_2(Z_3)]]></category>

		<guid isPermaLink="false">http://juanmarqz.wordpress.com/?p=4504</guid>
		<description><![CDATA[hae sunt matrices (estas son las matrices): , , , , , , , , , , , , , , , ,  &#8230; ante hoc dictionary Nunc, possibile est quod haec propositio quaerere: is it possible that: together with &#8230; <a href="http://juanmarqz.wordpress.com/2011/10/20/sl_2z3z-aliquis-ordo/">Continue reading <span class="meta-nav">&#8594;</span></a><img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4504&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p><strong>hae sunt matrices</strong> (estas son las matrices):</p>
<p><img src='http://s0.wp.com/latex.php?latex=a%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D0%261%5C%5C+2%260%5Cend%7Barray%7D%5Cright%29+&amp;bg=eeccee&amp;fg=000066&amp;s=1' alt='a=&#92;left(&#92;begin{array}{cc}0&amp;1&#92;&#92; 2&amp;0&#92;end{array}&#92;right) ' title='a=&#92;left(&#92;begin{array}{cc}0&amp;1&#92;&#92; 2&amp;0&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=b%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D0%261%5C%5C+2%261%5Cend%7Barray%7D%5Cright%29+&amp;bg=ffccee&amp;fg=000066&amp;s=1' alt='b=&#92;left(&#92;begin{array}{cc}0&amp;1&#92;&#92; 2&amp;1&#92;end{array}&#92;right) ' title='b=&#92;left(&#92;begin{array}{cc}0&amp;1&#92;&#92; 2&amp;1&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=ba%5E3b%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D0%261%5C%5C+2%262%5Cend%7Barray%7D%5Cright%29+&amp;bg=ccccee&amp;fg=000066&amp;s=1' alt='ba^3b=&#92;left(&#92;begin{array}{cc}0&amp;1&#92;&#92; 2&amp;2&#92;end{array}&#92;right) ' title='ba^3b=&#92;left(&#92;begin{array}{cc}0&amp;1&#92;&#92; 2&amp;2&#92;end{array}&#92;right) ' class='latex' /></p>
<p><img src='http://s0.wp.com/latex.php?latex=a%5E3%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D0%262%5C%5C+1%260%5Cend%7Barray%7D%5Cright%29+&amp;bg=ccddee&amp;fg=000066&amp;s=1' alt='a^3=&#92;left(&#92;begin{array}{cc}0&amp;2&#92;&#92; 1&amp;0&#92;end{array}&#92;right) ' title='a^3=&#92;left(&#92;begin{array}{cc}0&amp;2&#92;&#92; 1&amp;0&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=bab%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D0%262%5C%5C+1%261%5Cend%7Barray%7D%5Cright%29+&amp;bg=ccddee&amp;fg=000066&amp;s=1' alt='bab=&#92;left(&#92;begin{array}{cc}0&amp;2&#92;&#92; 1&amp;1&#92;end{array}&#92;right) ' title='bab=&#92;left(&#92;begin{array}{cc}0&amp;2&#92;&#92; 1&amp;1&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=a%5E2b%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D0%262%5C%5C+1%262%5Cend%7Barray%7D%5Cright%29+&amp;bg=ccddee&amp;fg=000066&amp;s=1' alt='a^2b=&#92;left(&#92;begin{array}{cc}0&amp;2&#92;&#92; 1&amp;2&#92;end{array}&#92;right) ' title='a^2b=&#92;left(&#92;begin{array}{cc}0&amp;2&#92;&#92; 1&amp;2&#92;end{array}&#92;right) ' class='latex' /></p>
<p><img src='http://s0.wp.com/latex.php?latex=e%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%260%5C%5C+0%261%5Cend%7Barray%7D%5Cright%29+&amp;bg=ccccff&amp;fg=000066&amp;s=1' alt='e=&#92;left(&#92;begin{array}{cc}1&amp;0&#92;&#92; 0&amp;1&#92;end{array}&#92;right) ' title='e=&#92;left(&#92;begin{array}{cc}1&amp;0&#92;&#92; 0&amp;1&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=a%5E2ba%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%260%5C%5C+1%261%5Cend%7Barray%7D%5Cright%29+&amp;bg=ccddff&amp;fg=000066&amp;s=1' alt='a^2ba=&#92;left(&#92;begin{array}{cc}1&amp;0&#92;&#92; 1&amp;1&#92;end{array}&#92;right) ' title='a^2ba=&#92;left(&#92;begin{array}{cc}1&amp;0&#92;&#92; 1&amp;1&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=%28ba%29%5E2%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%260%5C%5C+2%261%5Cend%7Barray%7D%5Cright%29+&amp;bg=eeccff&amp;fg=000066&amp;s=1' alt='(ba)^2=&#92;left(&#92;begin{array}{cc}1&amp;0&#92;&#92; 2&amp;1&#92;end{array}&#92;right) ' title='(ba)^2=&#92;left(&#92;begin{array}{cc}1&amp;0&#92;&#92; 2&amp;1&#92;end{array}&#92;right) ' class='latex' /></p>
<p><img src='http://s0.wp.com/latex.php?latex=%28ab%29%5E2%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%261%5C%5C+0%261%5Cend%7Barray%7D%5Cright%29+&amp;bg=ccddee&amp;fg=000066&amp;s=1' alt='(ab)^2=&#92;left(&#92;begin{array}{cc}1&amp;1&#92;&#92; 0&amp;1&#92;end{array}&#92;right) ' title='(ab)^2=&#92;left(&#92;begin{array}{cc}1&amp;1&#92;&#92; 0&amp;1&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=b%5E2ab%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%261%5C%5C+1%262%5Cend%7Barray%7D%5Cright%29+&amp;bg=ccddff&amp;fg=000066&amp;s=1' alt='b^2ab=&#92;left(&#92;begin{array}{cc}1&amp;1&#92;&#92; 1&amp;2&#92;end{array}&#92;right) ' title='b^2ab=&#92;left(&#92;begin{array}{cc}1&amp;1&#92;&#92; 1&amp;2&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=a%5E3ba%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%261%5C%5C+2%260%5Cend%7Barray%7D%5Cright%29+&amp;bg=ccddcc&amp;fg=000066&amp;s=1' alt='a^3ba=&#92;left(&#92;begin{array}{cc}1&amp;1&#92;&#92; 2&amp;0&#92;end{array}&#92;right) ' title='a^3ba=&#92;left(&#92;begin{array}{cc}1&amp;1&#92;&#92; 2&amp;0&#92;end{array}&#92;right) ' class='latex' /></p>
<p><img src='http://s0.wp.com/latex.php?latex=a%5E3b%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%262%5C%5C+0%261%5Cend%7Barray%7D%5Cright%29+&amp;bg=ddddcc&amp;fg=000066&amp;s=1' alt='a^3b=&#92;left(&#92;begin{array}{cc}1&amp;2&#92;&#92; 0&amp;1&#92;end{array}&#92;right) ' title='a^3b=&#92;left(&#92;begin{array}{cc}1&amp;2&#92;&#92; 0&amp;1&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=a%5E2b%5E2%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%262%5C%5C+1%260%5Cend%7Barray%7D%5Cright%29+&amp;bg=dddddd&amp;fg=000066&amp;s=1' alt='a^2b^2=&#92;left(&#92;begin{array}{cc}1&amp;2&#92;&#92; 1&amp;0&#92;end{array}&#92;right) ' title='a^2b^2=&#92;left(&#92;begin{array}{cc}1&amp;2&#92;&#92; 1&amp;0&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=bab%5E2%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%262%5C%5C+2%262%5Cend%7Barray%7D%5Cright%29+&amp;bg=ddddee&amp;fg=000066&amp;s=1' alt='bab^2=&#92;left(&#92;begin{array}{cc}1&amp;2&#92;&#92; 2&amp;2&#92;end{array}&#92;right) ' title='bab^2=&#92;left(&#92;begin{array}{cc}1&amp;2&#92;&#92; 2&amp;2&#92;end{array}&#92;right) ' class='latex' /></p>
<p><img src='http://s0.wp.com/latex.php?latex=a%5E2%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D2%260%5C%5C+0%262%5Cend%7Barray%7D%5Cright%29+&amp;bg=bbbbcc&amp;fg=000066&amp;s=1' alt='a^2=&#92;left(&#92;begin{array}{cc}2&amp;0&#92;&#92; 0&amp;2&#92;end{array}&#92;right) ' title='a^2=&#92;left(&#92;begin{array}{cc}2&amp;0&#92;&#92; 0&amp;2&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=ab%5E2%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D2%260%5C%5C+1%262%5Cend%7Barray%7D%5Cright%29+&amp;bg=bbbbdd&amp;fg=000066&amp;s=1' alt='ab^2=&#92;left(&#92;begin{array}{cc}2&amp;0&#92;&#92; 1&amp;2&#92;end{array}&#92;right) ' title='ab^2=&#92;left(&#92;begin{array}{cc}2&amp;0&#92;&#92; 1&amp;2&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=ba%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D2%260%5C%5C+2%262%5Cend%7Barray%7D%5Cright%29+&amp;bg=bbbbee&amp;fg=000066&amp;s=1' alt='ba=&#92;left(&#92;begin{array}{cc}2&amp;0&#92;&#92; 2&amp;2&#92;end{array}&#92;right) ' title='ba=&#92;left(&#92;begin{array}{cc}2&amp;0&#92;&#92; 2&amp;2&#92;end{array}&#92;right) ' class='latex' /></p>
<p><img src='http://s0.wp.com/latex.php?latex=ab%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D2%261%5C%5C+0%262%5Cend%7Barray%7D%5Cright%29+&amp;bg=bbddcc&amp;fg=000066&amp;s=1' alt='ab=&#92;left(&#92;begin{array}{cc}2&amp;1&#92;&#92; 0&amp;2&#92;end{array}&#92;right) ' title='ab=&#92;left(&#92;begin{array}{cc}2&amp;1&#92;&#92; 0&amp;2&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=b%5E2aba%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D2%261%5C%5C+1%261%5Cend%7Barray%7D%5Cright%29+&amp;bg=bbdddd&amp;fg=000066&amp;s=1' alt='b^2aba=&#92;left(&#92;begin{array}{cc}2&amp;1&#92;&#92; 1&amp;1&#92;end{array}&#92;right) ' title='b^2aba=&#92;left(&#92;begin{array}{cc}2&amp;1&#92;&#92; 1&amp;1&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=b%5E2%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D2%261%5C%5C+2%260%5Cend%7Barray%7D%5Cright%29+&amp;bg=bbddee&amp;fg=000066&amp;s=1' alt='b^2=&#92;left(&#92;begin{array}{cc}2&amp;1&#92;&#92; 2&amp;0&#92;end{array}&#92;right) ' title='b^2=&#92;left(&#92;begin{array}{cc}2&amp;1&#92;&#92; 2&amp;0&#92;end{array}&#92;right) ' class='latex' /></p>
<p><img src='http://s0.wp.com/latex.php?latex=b%5E2a%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D2%262%5C%5C+0%262%5Cend%7Barray%7D%5Cright%29+&amp;bg=bbddaa&amp;fg=000066&amp;s=1' alt='b^2a=&#92;left(&#92;begin{array}{cc}2&amp;2&#92;&#92; 0&amp;2&#92;end{array}&#92;right) ' title='b^2a=&#92;left(&#92;begin{array}{cc}2&amp;2&#92;&#92; 0&amp;2&#92;end{array}&#92;right) ' class='latex' />, <img src='http://s0.wp.com/latex.php?latex=aba%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D2%262%5C%5C+1%260%5Cend%7Barray%7D%5Cright%29+&amp;bg=bbccee&amp;fg=000066&amp;s=1' alt='aba=&#92;left(&#92;begin{array}{cc}2&amp;2&#92;&#92; 1&amp;0&#92;end{array}&#92;right) ' title='aba=&#92;left(&#92;begin{array}{cc}2&amp;2&#92;&#92; 1&amp;0&#92;end{array}&#92;right) ' class='latex' />,  <img src='http://s0.wp.com/latex.php?latex=abab%5E2%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D2%262%5C%5C+2%261%5Cend%7Barray%7D%5Cright%29+&amp;bg=bbeedd&amp;fg=000066&amp;s=1' alt='abab^2=&#92;left(&#92;begin{array}{cc}2&amp;2&#92;&#92; 2&amp;1&#92;end{array}&#92;right) ' title='abab^2=&#92;left(&#92;begin{array}{cc}2&amp;2&#92;&#92; 2&amp;1&#92;end{array}&#92;right) ' class='latex' /></p>
<p><strong>&#8230; ante hoc dictionary</strong></p>
<p><strong>Nunc, possibile est quod haec propositio quaerere</strong>:</p>
<p style="text-align:center;"><img src='http://s0.wp.com/latex.php?latex=%5Clangle+a%2Cb%5C+%3A%5C+a%5E4%3De%2C+b%5E6%3De%2C+a%5E2b%3Dba%5E2%5Crangle&amp;bg=ffffdd&amp;fg=333333&amp;s=2' alt='&#92;langle a,b&#92; :&#92; a^4=e, b^6=e, a^2b=ba^2&#92;rangle' title='&#92;langle a,b&#92; :&#92; a^4=e, b^6=e, a^2b=ba^2&#92;rangle' class='latex' /></p>
<ul>
<li>is it possible that: <img src='http://s0.wp.com/latex.php?latex=a%5E2b%3Dba%5E2&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='a^2b=ba^2' title='a^2b=ba^2' class='latex' /> together with <img src='http://s0.wp.com/latex.php?latex=a%5E4%3De&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='a^4=e' title='a^4=e' class='latex' /> and <img src='http://s0.wp.com/latex.php?latex=b%5E6%3De&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='b^6=e' title='b^6=e' class='latex' /> they imply <img src='http://s0.wp.com/latex.php?latex=a%5E2%3Db%5E3&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='a^2=b^3' title='a^2=b^3' class='latex' />?</li>
</ul>
<p><a href="http://en.wikipedia.org/wiki/File:SL%282,3%29;_Cayley_table.svg">http://en.wikipedia.org/wiki/File:SL%282,3%29;_Cayley_table.svg</a></p>
<p><img class="alignleft" title="SL_2(Z_3)" src="http://upload.wikimedia.org/wikipedia/commons/thumb/2/23/SL%282%2C3%29%3B_Cayley_table.svg/600px-SL%282%2C3%29%3B_Cayley_table.svg.png" alt="" width="359" height="359" /></p>
<p>for more on Cayley tables go</p>
<p><strong><a href="http://commons.wikimedia.org/wiki/Category:Cayley_tables">Cayley</a></strong></p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p><strong>(10.nov.2011)</strong></p>
<p>Usando la teoría básica de grupos podremos construir un subgrupo de 12 elementos usando un subgrupo de orden tres y otro subgrupo de orden cuatro:</p>
<blockquote>
<p style="text-align:left;">Con <img src='http://s0.wp.com/latex.php?latex=H%3D%5Clangle+p%7Cp%5E3%3De%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='H=&#92;langle p|p^3=e&#92;rangle' title='H=&#92;langle p|p^3=e&#92;rangle' class='latex' /> y con <img src='http://s0.wp.com/latex.php?latex=K%3D%5Clangle+q%7Cq%5E4%3De%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='K=&#92;langle q|q^4=e&#92;rangle' title='K=&#92;langle q|q^4=e&#92;rangle' class='latex' /> armamos <img src='http://s0.wp.com/latex.php?latex=HK&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='HK' title='HK' class='latex' />. Así <img src='http://s0.wp.com/latex.php?latex=HK&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='HK' title='HK' class='latex' /> tendrá 12 elementos y pues <img src='http://s0.wp.com/latex.php?latex=H%5Ccap+K%3D%5C%7Be%5C%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='H&#92;cap K=&#92;{e&#92;}' title='H&#92;cap K=&#92;{e&#92;}' class='latex' />.</p>
</blockquote>
<p style="text-align:left;">Chéquelo con <img src='http://s0.wp.com/latex.php?latex=p%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%261%5C%5C+0%261%5Cend%7Barray%7D%5Cright%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='p=&#92;left(&#92;begin{array}{cc}1&amp;1&#92;&#92; 0&amp;1&#92;end{array}&#92;right)' title='p=&#92;left(&#92;begin{array}{cc}1&amp;1&#92;&#92; 0&amp;1&#92;end{array}&#92;right)' class='latex' />  y <img src='http://s0.wp.com/latex.php?latex=q%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%261%5C%5C+1%262%5Cend%7Barray%7D%5Cright%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='q=&#92;left(&#92;begin{array}{cc}1&amp;1&#92;&#92; 1&amp;2&#92;end{array}&#92;right)' title='q=&#92;left(&#92;begin{array}{cc}1&amp;1&#92;&#92; 1&amp;2&#92;end{array}&#92;right)' class='latex' />.</p>
<p style="text-align:left;">El que queriamos armar usando <img src='http://s0.wp.com/latex.php?latex=%5Clangle%5C%7Ba%5E2%2Cb%5C%7D%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle&#92;{a^2,b&#92;}&#92;rangle' title='&#92;langle&#92;{a^2,b&#92;}&#92;rangle' class='latex' />, no funciona para obtener un subgrupo de 12 elementos,  pues porque, sabiendo <img src='http://s0.wp.com/latex.php?latex=a%5E2%3Db%5E3&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='a^2=b^3' title='a^2=b^3' class='latex' />, tendremos <img src='http://s0.wp.com/latex.php?latex=%5Clangle+a%5E2%5Crangle%3C%5Clangle+b%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle a^2&#92;rangle&lt;&#92;langle b&#92;rangle' title='&#92;langle a^2&#92;rangle&lt;&#92;langle b&#92;rangle' class='latex' /> y por lo tanto <img src='http://s0.wp.com/latex.php?latex=%5Clangle%5C%7Ba%5E2%2Cb%5C%7D%5Crangle%3D%5Clangle+b%5Crangle&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;langle&#92;{a^2,b&#92;}&#92;rangle=&#92;langle b&#92;rangle' title='&#92;langle&#92;{a^2,b&#92;}&#92;rangle=&#92;langle b&#92;rangle' class='latex' />.</p>
<br />Filed under: <a href='http://juanmarqz.wordpress.com/category/algebra/'>algebra</a>, <a href='http://juanmarqz.wordpress.com/category/cucei-math/'>cucei math</a>, <a href='http://juanmarqz.wordpress.com/category/math/'>math</a>, <a href='http://juanmarqz.wordpress.com/category/tex/'>tex</a> Tagged: <a href='http://juanmarqz.wordpress.com/tag/algebra/'>algebra</a>, <a href='http://juanmarqz.wordpress.com/tag/group-theory/'>group theory</a>, <a href='http://juanmarqz.wordpress.com/tag/latin/'>latin</a>, <a href='http://juanmarqz.wordpress.com/tag/sl_2z_3/'>SL_2(Z_3)</a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gocomments/juanmarqz.wordpress.com/4504/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/comments/juanmarqz.wordpress.com/4504/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godelicious/juanmarqz.wordpress.com/4504/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/delicious/juanmarqz.wordpress.com/4504/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gofacebook/juanmarqz.wordpress.com/4504/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/facebook/juanmarqz.wordpress.com/4504/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gotwitter/juanmarqz.wordpress.com/4504/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/twitter/juanmarqz.wordpress.com/4504/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gostumble/juanmarqz.wordpress.com/4504/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/stumble/juanmarqz.wordpress.com/4504/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godigg/juanmarqz.wordpress.com/4504/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/digg/juanmarqz.wordpress.com/4504/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/goreddit/juanmarqz.wordpress.com/4504/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/reddit/juanmarqz.wordpress.com/4504/" /></a> <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4504&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></content:encoded>
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		<slash:comments>12</slash:comments>
	
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			<media:title type="html">juanmarqz</media:title>
		</media:content>

		<media:content url="http://upload.wikimedia.org/wikipedia/commons/thumb/2/23/SL%282%2C3%29%3B_Cayley_table.svg/600px-SL%282%2C3%29%3B_Cayley_table.svg.png" medium="image">
			<media:title type="html">SL_2(Z_3)</media:title>
		</media:content>
	</item>
		<item>
		<title>función contadora</title>
		<link>http://juanmarqz.wordpress.com/2011/10/17/funcion-contadora/</link>
		<comments>http://juanmarqz.wordpress.com/2011/10/17/funcion-contadora/#comments</comments>
		<pubDate>Tue, 18 Oct 2011 01:52:57 +0000</pubDate>
		<dc:creator>juanmarqz</dc:creator>
				<category><![CDATA[math]]></category>
		<category><![CDATA[bijection]]></category>
		<category><![CDATA[función contadora]]></category>
		<category><![CDATA[set theory]]></category>

		<guid isPermaLink="false">http://juanmarqz.wordpress.com/?p=4493</guid>
		<description><![CDATA[sigue a contadora para ver los algunos detalles de la biyección que etiqueta las intersecciones de líneas verticales con horizontales espacidas a distancia uno entre ellas. Filed under: math Tagged: bijection, función contadora, set theory<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4493&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>sigue a <a href="http://juanmarqz.wordpress.com/2011/02/17/algunos-trucos-matematicos-en-spanish/"><strong>contadora</strong></a> para ver los algunos detalles de la biyección <img src='http://s0.wp.com/latex.php?latex=%7B%5Cmathbb%7BN%7D%7D%5Ctimes%7B%5Cmathbb%7BN%7D%7D%5Cto%7B%5Cmathbb%7BN%7D%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='{&#92;mathbb{N}}&#92;times{&#92;mathbb{N}}&#92;to{&#92;mathbb{N}}' title='{&#92;mathbb{N}}&#92;times{&#92;mathbb{N}}&#92;to{&#92;mathbb{N}}' class='latex' /> que etiqueta las intersecciones de líneas verticales con horizontales espacidas a distancia uno entre ellas.</p>
<p><a href="http://juanmarqz.wordpress.com/2011/02/17/algunos-trucos-matematicos-en-spanish/quenta/" rel="attachment wp-att-3966"><img class="aligncenter size-medium wp-image-3966" title="quenta" src="http://juanmarqz.files.wordpress.com/2011/02/quenta.png?w=300&#038;h=191" alt="" width="300" height="191" /></a></p>
<br />Filed under: <a href='http://juanmarqz.wordpress.com/category/math/'>math</a> Tagged: <a href='http://juanmarqz.wordpress.com/tag/bijection/'>bijection</a>, <a href='http://juanmarqz.wordpress.com/tag/funcion-contadora/'>función contadora</a>, <a href='http://juanmarqz.wordpress.com/tag/set-theory/'>set theory</a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gocomments/juanmarqz.wordpress.com/4493/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/comments/juanmarqz.wordpress.com/4493/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godelicious/juanmarqz.wordpress.com/4493/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/delicious/juanmarqz.wordpress.com/4493/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gofacebook/juanmarqz.wordpress.com/4493/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/facebook/juanmarqz.wordpress.com/4493/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gotwitter/juanmarqz.wordpress.com/4493/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/twitter/juanmarqz.wordpress.com/4493/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gostumble/juanmarqz.wordpress.com/4493/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/stumble/juanmarqz.wordpress.com/4493/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godigg/juanmarqz.wordpress.com/4493/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/digg/juanmarqz.wordpress.com/4493/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/goreddit/juanmarqz.wordpress.com/4493/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/reddit/juanmarqz.wordpress.com/4493/" /></a> <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4493&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></content:encoded>
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			<media:title type="html">juanmarqz</media:title>
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		<media:content url="http://juanmarqz.files.wordpress.com/2011/02/quenta.png?w=300" medium="image">
			<media:title type="html">quenta</media:title>
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		<item>
		<title>math-marqz a&#8217;lgebra</title>
		<link>http://juanmarqz.wordpress.com/2011/10/11/math-marqz-algebra/</link>
		<comments>http://juanmarqz.wordpress.com/2011/10/11/math-marqz-algebra/#comments</comments>
		<pubDate>Tue, 11 Oct 2011 05:42:31 +0000</pubDate>
		<dc:creator>juanmarqz</dc:creator>
				<category><![CDATA[algebra]]></category>
		<category><![CDATA[group theory]]></category>
		<category><![CDATA[multilinear algebra]]></category>
		<category><![CDATA[cucei]]></category>
		<category><![CDATA[cucei math]]></category>

		<guid isPermaLink="false">http://juanmarqz.wordpress.com/?p=4484</guid>
		<description><![CDATA[ha sido muy grato ver la cantidad de descargas de los documentos relativos a la multilineal y moderna uno, que por aquí se encuentran : ) Es ultra-grato servirle. Filed under: algebra, group theory, multilinear algebra Tagged: cucei, cucei math<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4484&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>ha sido muy grato ver la cantidad de descargas de los documentos relativos a la <strong>multilineal</strong> y <strong>moderna uno</strong>, que por aquí se encuentran : )</p>
<p>Es ultra-grato servirle.</p>
<br />Filed under: <a href='http://juanmarqz.wordpress.com/category/algebra/'>algebra</a>, <a href='http://juanmarqz.wordpress.com/category/algebra/group-theory/'>group theory</a>, <a href='http://juanmarqz.wordpress.com/category/algebra/multilinear-algebra/'>multilinear algebra</a> Tagged: <a href='http://juanmarqz.wordpress.com/tag/cucei/'>cucei</a>, <a href='http://juanmarqz.wordpress.com/tag/cucei-math/'>cucei math</a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gocomments/juanmarqz.wordpress.com/4484/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/comments/juanmarqz.wordpress.com/4484/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godelicious/juanmarqz.wordpress.com/4484/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/delicious/juanmarqz.wordpress.com/4484/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gofacebook/juanmarqz.wordpress.com/4484/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/facebook/juanmarqz.wordpress.com/4484/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gotwitter/juanmarqz.wordpress.com/4484/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/twitter/juanmarqz.wordpress.com/4484/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gostumble/juanmarqz.wordpress.com/4484/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/stumble/juanmarqz.wordpress.com/4484/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godigg/juanmarqz.wordpress.com/4484/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/digg/juanmarqz.wordpress.com/4484/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/goreddit/juanmarqz.wordpress.com/4484/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/reddit/juanmarqz.wordpress.com/4484/" /></a> <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4484&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></content:encoded>
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			<media:title type="html">juanmarqz</media:title>
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		<item>
		<title>SL_2(Z_3) again</title>
		<link>http://juanmarqz.wordpress.com/2011/10/08/sl_2z_3-2/</link>
		<comments>http://juanmarqz.wordpress.com/2011/10/08/sl_2z_3-2/#comments</comments>
		<pubDate>Sat, 08 Oct 2011 17:32:04 +0000</pubDate>
		<dc:creator>juanmarqz</dc:creator>
				<category><![CDATA[algebra]]></category>
		<category><![CDATA[group theory]]></category>
		<category><![CDATA[numbers]]></category>
		<category><![CDATA[what is math]]></category>
		<category><![CDATA[abstract algebra]]></category>
		<category><![CDATA[algebra abstracta]]></category>
		<category><![CDATA[cucei]]></category>
		<category><![CDATA[SL_2(Z_3)]]></category>

		<guid isPermaLink="false">http://juanmarqz.wordpress.com/?p=4474</guid>
		<description><![CDATA[this group is great,&#8230; if you don&#8217;t believe checkout: http://finitegeometry.org/sc/pg/dt/visu.html there, it is its supergroup GL_2(Z_3). the missing matrix in this photo is Filed under: algebra, group theory, numbers, what is math Tagged: abstract algebra, algebra, algebra abstracta, cucei, SL_2(Z_3)<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4474&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>this group is great,&#8230; if you don&#8217;t believe checkout:</p>
<p><strong><a href="http://finitegeometry.org/sc/pg/dt/visu.html">http://finitegeometry.org/sc/pg/dt/visu.html</a></strong></p>
<p>there, it is its supergroup GL_2(Z_3).</p>
<p><a href="http://juanmarqz.wordpress.com/2011/10/08/sl_2z_3-2/sl2z3/" rel="attachment wp-att-4477"><img class="aligncenter size-medium wp-image-4477" title="sl2z3" src="http://juanmarqz.files.wordpress.com/2011/10/sl2z3.jpg?w=300&#038;h=225" alt="" width="300" height="225" /></a></p>
<p>the missing matrix in this photo is <img src='http://s0.wp.com/latex.php?latex=%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D0%261%5C%5C+2%262%5Cend%7Barray%7D%5Cright%29+&amp;bg=ccccee&amp;fg=000066&amp;s=1' alt='&#92;left(&#92;begin{array}{cc}0&amp;1&#92;&#92; 2&amp;2&#92;end{array}&#92;right) ' title='&#92;left(&#92;begin{array}{cc}0&amp;1&#92;&#92; 2&amp;2&#92;end{array}&#92;right) ' class='latex' /></p>
<br />Filed under: <a href='http://juanmarqz.wordpress.com/category/algebra/'>algebra</a>, <a href='http://juanmarqz.wordpress.com/category/algebra/group-theory/'>group theory</a>, <a href='http://juanmarqz.wordpress.com/category/math/maths/numbers/'>numbers</a>, <a href='http://juanmarqz.wordpress.com/category/what-is-math/'>what is math</a> Tagged: <a href='http://juanmarqz.wordpress.com/tag/abstract-algebra/'>abstract algebra</a>, <a href='http://juanmarqz.wordpress.com/tag/algebra/'>algebra</a>, <a href='http://juanmarqz.wordpress.com/tag/algebra-abstracta/'>algebra abstracta</a>, <a href='http://juanmarqz.wordpress.com/tag/cucei/'>cucei</a>, <a href='http://juanmarqz.wordpress.com/tag/sl_2z_3/'>SL_2(Z_3)</a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gocomments/juanmarqz.wordpress.com/4474/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/comments/juanmarqz.wordpress.com/4474/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godelicious/juanmarqz.wordpress.com/4474/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/delicious/juanmarqz.wordpress.com/4474/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gofacebook/juanmarqz.wordpress.com/4474/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/facebook/juanmarqz.wordpress.com/4474/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gotwitter/juanmarqz.wordpress.com/4474/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/twitter/juanmarqz.wordpress.com/4474/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/gostumble/juanmarqz.wordpress.com/4474/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/stumble/juanmarqz.wordpress.com/4474/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/godigg/juanmarqz.wordpress.com/4474/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/digg/juanmarqz.wordpress.com/4474/" /></a> <a rel="nofollow" href="http://feeds.wordpress.com/1.0/goreddit/juanmarqz.wordpress.com/4474/"><img alt="" border="0" src="http://feeds.wordpress.com/1.0/reddit/juanmarqz.wordpress.com/4474/" /></a> <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4474&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></content:encoded>
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			<media:title type="html">sl2z3</media:title>
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		<title>problems de álgebra moderna uno: I</title>
		<link>http://juanmarqz.wordpress.com/2011/10/06/problems-de-algebra-moderna-uno-i/</link>
		<comments>http://juanmarqz.wordpress.com/2011/10/06/problems-de-algebra-moderna-uno-i/#comments</comments>
		<pubDate>Thu, 06 Oct 2011 19:22:14 +0000</pubDate>
		<dc:creator>juanmarqz</dc:creator>
				<category><![CDATA[algebra]]></category>
		<category><![CDATA[cucei math]]></category>
		<category><![CDATA[group theory]]></category>
		<category><![CDATA[what is mathematics]]></category>
		<category><![CDATA[cucei]]></category>
		<category><![CDATA[función contadora]]></category>
		<category><![CDATA[lógica]]></category>
		<category><![CDATA[logic]]></category>
		<category><![CDATA[trick educating young mathematicians]]></category>

		<guid isPermaLink="false">http://juanmarqz.wordpress.com/?p=4448</guid>
		<description><![CDATA[Para divertirse estos días de trabajo: http://juanmarqz.files.wordpress.com/2011/10/canonproblms.pdf Samples: Sea un map. Sean entonces i) ¿? Solución: Es fácil la contención . La otra contención no siempre es posible: pues si entonces   y , esto implica que existen y tales &#8230; <a href="http://juanmarqz.wordpress.com/2011/10/06/problems-de-algebra-moderna-uno-i/">Continue reading <span class="meta-nav">&#8594;</span></a><img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=juanmarqz.wordpress.com&amp;blog=8635364&amp;post=4448&amp;subd=juanmarqz&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Para divertirse estos días de trabajo:</p>
<p><a href="http://juanmarqz.files.wordpress.com/2011/10/canonproblms.pdf">http://juanmarqz.files.wordpress.com/2011/10/canonproblms.pdf</a></p>
<p>Samples:</p>
<ul>
<li>Sea <img src='http://s0.wp.com/latex.php?latex=f%3AS%5Cto+T&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='f:S&#92;to T' title='f:S&#92;to T' class='latex' /> un map. Sean <img src='http://s0.wp.com/latex.php?latex=A%2CB%5Csubset+S&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='A,B&#92;subset S' title='A,B&#92;subset S' class='latex' /> entonces</li>
</ul>
<p>i) ¿<img src='http://s0.wp.com/latex.php?latex=f%28A%5Ccap+B%29%3Df%28A%29%5Ccap+f%28B%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='f(A&#92;cap B)=f(A)&#92;cap f(B)' title='f(A&#92;cap B)=f(A)&#92;cap f(B)' class='latex' />?</p>
<p><strong>Solución</strong>: Es fácil la contención <img src='http://s0.wp.com/latex.php?latex=f%28A%5Ccap+B%29%5Csubseteq+f%28A%29%5Ccap+f%28B%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='f(A&#92;cap B)&#92;subseteq f(A)&#92;cap f(B)' title='f(A&#92;cap B)&#92;subseteq f(A)&#92;cap f(B)' class='latex' />. La otra contención <img src='http://s0.wp.com/latex.php?latex=f%28A%5Ccap+B%29%5Csupseteq+f%28A%29%5Ccap+f%28B%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='f(A&#92;cap B)&#92;supseteq f(A)&#92;cap f(B)' title='f(A&#92;cap B)&#92;supseteq f(A)&#92;cap f(B)' class='latex' /> no siempre es posible: pues si <img src='http://s0.wp.com/latex.php?latex=t%5Cin+f%28A%29%5Ccap+f%28B%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='t&#92;in f(A)&#92;cap f(B)' title='t&#92;in f(A)&#92;cap f(B)' class='latex' /> entonces <img src='http://s0.wp.com/latex.php?latex=t%5Cin+f%28A%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='t&#92;in f(A)' title='t&#92;in f(A)' class='latex' />  y <img src='http://s0.wp.com/latex.php?latex=t%5Cin+f%28B%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='t&#92;in f(B)' title='t&#92;in f(B)' class='latex' />, esto implica que existen <img src='http://s0.wp.com/latex.php?latex=c%5Cin+A&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='c&#92;in A' title='c&#92;in A' class='latex' /> y <img src='http://s0.wp.com/latex.php?latex=d%5Cin+B&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='d&#92;in B' title='d&#92;in B' class='latex' /> tales que <img src='http://s0.wp.com/latex.php?latex=f%28c%29%3Df%28d%29%3Dt&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='f(c)=f(d)=t' title='f(c)=f(d)=t' class='latex' />. Pero esto no implica que exista <img src='http://s0.wp.com/latex.php?latex=a%5Cin+A%5Ccap+B&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='a&#92;in A&#92;cap B' title='a&#92;in A&#92;cap B' class='latex' /> talque <img src='http://s0.wp.com/latex.php?latex=f%28a%29%3Dt&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='f(a)=t' title='f(a)=t' class='latex' />&#8230;</p>
<p>ii) Sean <img src='http://s0.wp.com/latex.php?latex=X%2CY%5Csubset+T&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='X,Y&#92;subset T' title='X,Y&#92;subset T' class='latex' />. Demuestra <img src='http://s0.wp.com/latex.php?latex=f%5E%7B-1%7D%28X%5Ccup+Y%29%3Df%5E%7B-1%7D%28X%29%5Ccup+f%5E%7B-1%7D%28Y%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='f^{-1}(X&#92;cup Y)=f^{-1}(X)&#92;cup f^{-1}(Y)' title='f^{-1}(X&#92;cup Y)=f^{-1}(X)&#92;cup f^{-1}(Y)' class='latex' /></p>
<ul>
<li>La función <img src='http://s0.wp.com/latex.php?latex=%5Cphi%28n%2Cm%29%3Dm%2B%5Cfrac%7B%28n%2Bm%29%28n%2Bm%2B1%29%7D%7B2%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;phi(n,m)=m+&#92;frac{(n+m)(n+m+1)}{2}' title='&#92;phi(n,m)=m+&#92;frac{(n+m)(n+m+1)}{2}' class='latex' />mapea <img src='http://s0.wp.com/latex.php?latex=%7B%5Cmathbb%7BN%7D%7D%5Ctimes%7B%5Cmathbb%7BN%7D%7D%5Cto%7B%5Cmathbb%7BN%7D%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='{&#92;mathbb{N}}&#92;times{&#92;mathbb{N}}&#92;to{&#92;mathbb{N}}' title='{&#92;mathbb{N}}&#92;times{&#92;mathbb{N}}&#92;to{&#92;mathbb{N}}' class='latex' />. Demuestra que es una biyección. <a href="http://juanmarqz.wordpress.com/2011/02/17/algunos-trucos-matematicos-en-spanish/"><strong>Solución.</strong></a></li>
</ul>
<ul>
<li style="text-align:left;"> Sea <img src='http://s0.wp.com/latex.php?latex=f%3AS%5Cto+T&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='f:S&#92;to T' title='f:S&#92;to T' class='latex' /> un map sobreyectivo. Demuestra que si para cualquiera dos <img src='http://s0.wp.com/latex.php?latex=x%2Cy%5Cin+S&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='x,y&#92;in S' title='x,y&#92;in S' class='latex' /> definimos: <img src='http://s0.wp.com/latex.php?latex=x%5Csim+y%5C+%5CLongleftrightarrow+f%28x%29%3Df%28y%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='x&#92;sim y&#92; &#92;Longleftrightarrow f(x)=f(y)' title='x&#92;sim y&#92; &#92;Longleftrightarrow f(x)=f(y)' class='latex' />, entonces esto determina una relación de equivalencia en <img src='http://s0.wp.com/latex.php?latex=S&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='S' title='S' class='latex' /></li>
<li>Demuestra que el map <img src='http://s0.wp.com/latex.php?latex=%7B%5Cmathbb%7BR%7D%7D%5Cto+%28-1%2C1%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='{&#92;mathbb{R}}&#92;to (-1,1)' title='{&#92;mathbb{R}}&#92;to (-1,1)' class='latex' />, de los reales al intervalo abierto <img src='http://s0.wp.com/latex.php?latex=x%5Cin%7B%5Cmathbb%7BR%7D%7D%3A+-1%3Cx%3C1&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='x&#92;in{&#92;mathbb{R}}: -1&lt;x&lt;1' title='x&#92;in{&#92;mathbb{R}}: -1&lt;x&lt;1' class='latex' />, dando por</li>
</ul>
<p style="text-align:center;"><img src='http://s0.wp.com/latex.php?latex=x%5Cmapsto+%5Cfrac%7Bx%7D%7B1%2B%7Cx%7C%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='x&#92;mapsto &#92;frac{x}{1+|x|}' title='x&#92;mapsto &#92;frac{x}{1+|x|}' class='latex' /></p>
<p style="text-align:left;">es una biyección.<strong> Solución: </strong>Aquí algunos detalles pero desordenados: El cero se mapea en el cero. Note que <img src='http://s0.wp.com/latex.php?latex=%5Cfrac%7Bx%7D%7B1%2B%7Cx%7C%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;frac{x}{1+|x|}' title='&#92;frac{x}{1+|x|}' class='latex' /> tiene el mismo signo que <img src='http://s0.wp.com/latex.php?latex=x&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='x' title='x' class='latex' />. Note también que <img src='http://s0.wp.com/latex.php?latex=x%3C1%2B%7Cx%7C&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='x&lt;1+|x|' title='x&lt;1+|x|' class='latex' /> entonces <img src='http://s0.wp.com/latex.php?latex=%7C%5Cfrac%7Bx%7D%7B1%2B%7Cx%7C%7D%7C%3C1&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='|&#92;frac{x}{1+|x|}|&lt;1' title='|&#92;frac{x}{1+|x|}|&lt;1' class='latex' /> y esto implica que el codominio es efectivamente el intervalo abierto <img src='http://s0.wp.com/latex.php?latex=%28-1%2C1%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='(-1,1)' title='(-1,1)' class='latex' /> o sea este map esta bien definido. Para la <em>inyectividad</em> hay varios casos según se elijan <img src='http://s0.wp.com/latex.php?latex=a%2Cb&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='a,b' title='a,b' class='latex' />:  ambos <img src='http://s0.wp.com/latex.php?latex=a%2Cb%3E0&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='a,b&gt;0' title='a,b&gt;0' class='latex' /> ó <img src='http://s0.wp.com/latex.php?latex=a%2Cb%3C0&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='a,b&lt;0' title='a,b&lt;0' class='latex' /> ó <img src='http://s0.wp.com/latex.php?latex=a%3C0%3Cb&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='a&lt;0&lt;b' title='a&lt;0&lt;b' class='latex' /> ó <img src='http://s0.wp.com/latex.php?latex=a%3E0%3Eb&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='a&gt;0&gt;b' title='a&gt;0&gt;b' class='latex' />, pero de todos modos si <img src='http://s0.wp.com/latex.php?latex=a%5Cneq+b&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='a&#92;neq b' title='a&#92;neq b' class='latex' /> y aunque pueda suceder <img src='http://s0.wp.com/latex.php?latex=1%2B%7Ca%7C%3D1%2B%7Cb%7C&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='1+|a|=1+|b|' title='1+|a|=1+|b|' class='latex' />  tendremos <img src='http://s0.wp.com/latex.php?latex=%5Cfrac%7Ba%7D%7B1%2B%7Ca%7C%7D%5Cneq+%5Cfrac%7Bb%7D%7B1%2B%7Cb%7C%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;frac{a}{1+|a|}&#92;neq &#92;frac{b}{1+|b|}' title='&#92;frac{a}{1+|a|}&#92;neq &#92;frac{b}{1+|b|}' class='latex' />. Para la <em>sobreyectividad</em> sea <img src='http://s0.wp.com/latex.php?latex=p%5Cin+%28-1%2C1%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='p&#92;in (-1,1)' title='p&#92;in (-1,1)' class='latex' /> para el cual buscamos <img src='http://s0.wp.com/latex.php?latex=c%5Cin%7B%5Cmathbb%7BR%7D%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='c&#92;in{&#92;mathbb{R}}' title='c&#92;in{&#92;mathbb{R}}' class='latex' /> talque <img src='http://s0.wp.com/latex.php?latex=%5Cfrac%7Bc%7D%7B1%2B%7Cc%7C%7D%3Dp&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;frac{c}{1+|c|}=p' title='&#92;frac{c}{1+|c|}=p' class='latex' />. Entonces tenemos que resolver <img src='http://s0.wp.com/latex.php?latex=%5Cfrac%7Bc%7D%7B1%2Bc%7D%3Dp&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;frac{c}{1+c}=p' title='&#92;frac{c}{1+c}=p' class='latex' /> para <img src='http://s0.wp.com/latex.php?latex=p%3E0&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='p&gt;0' title='p&gt;0' class='latex' /> o bien <img src='http://s0.wp.com/latex.php?latex=%5Cfrac%7Bc%7D%7B1-c%7D%3Dp&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;frac{c}{1-c}=p' title='&#92;frac{c}{1-c}=p' class='latex' /> para <img src='http://s0.wp.com/latex.php?latex=p%3C0&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='p&lt;0' title='p&lt;0' class='latex' />. En el primer caso <img src='http://s0.wp.com/latex.php?latex=c%3D%5Cfrac%7Bp%7D%7B1-p%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='c=&#92;frac{p}{1-p}' title='c=&#92;frac{p}{1-p}' class='latex' /> y en el otro <img src='http://s0.wp.com/latex.php?latex=c%3D%5Cfrac%7Bp%7D%7B1%2Bp%7D&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='c=&#92;frac{p}{1+p}' title='c=&#92;frac{p}{1+p}' class='latex' />.</p>
<ul>
<li><img src='http://s0.wp.com/latex.php?latex=%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%261%5C%5C+0%261%5Cend%7Barray%7D%5Cright%29%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%262%5C%5C+0%261%5Cend%7Barray%7D%5Cright%29%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%260%5C%5C+0%261%5Cend%7Barray%7D%5Cright%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;left(&#92;begin{array}{cc}1&amp;1&#92;&#92; 0&amp;1&#92;end{array}&#92;right)&#92;left(&#92;begin{array}{cc}1&amp;2&#92;&#92; 0&amp;1&#92;end{array}&#92;right)=&#92;left(&#92;begin{array}{cc}1&amp;0&#92;&#92; 0&amp;1&#92;end{array}&#92;right)' title='&#92;left(&#92;begin{array}{cc}1&amp;1&#92;&#92; 0&amp;1&#92;end{array}&#92;right)&#92;left(&#92;begin{array}{cc}1&amp;2&#92;&#92; 0&amp;1&#92;end{array}&#92;right)=&#92;left(&#92;begin{array}{cc}1&amp;0&#92;&#92; 0&amp;1&#92;end{array}&#92;right)' class='latex' />,  con entradas en <img src='http://s0.wp.com/latex.php?latex=%7B%5Cmathbb%7BZ%7D%7D_3&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='{&#92;mathbb{Z}}_3' title='{&#92;mathbb{Z}}_3' class='latex' /></li>
<li><img src='http://s0.wp.com/latex.php?latex=%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D2%262%5C%5C+2%261%5Cend%7Barray%7D%5Cright%29%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%262%5C%5C+1%262%5Cend%7Barray%7D%5Cright%29%3D%5Cleft%28%5Cbegin%7Barray%7D%7Bcc%7D1%260%5C%5C+0%261%5Cend%7Barray%7D%5Cright%29&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='&#92;left(&#92;begin{array}{cc}2&amp;2&#92;&#92; 2&amp;1&#92;end{array}&#92;right)&#92;left(&#92;begin{array}{cc}1&amp;2&#92;&#92; 1&amp;2&#92;end{array}&#92;right)=&#92;left(&#92;begin{array}{cc}1&amp;0&#92;&#92; 0&amp;1&#92;end{array}&#92;right)' title='&#92;left(&#92;begin{array}{cc}2&amp;2&#92;&#92; 2&amp;1&#92;end{array}&#92;right)&#92;left(&#92;begin{array}{cc}1&amp;2&#92;&#92; 1&amp;2&#92;end{array}&#92;right)=&#92;left(&#92;begin{array}{cc}1&amp;0&#92;&#92; 0&amp;1&#92;end{array}&#92;right)' class='latex' />,  también con entradas en <img src='http://s0.wp.com/latex.php?latex=%7B%5Cmathbb%7BZ%7D%7D_3&amp;bg=ffffff&amp;fg=333333&amp;s=0' alt='{&#92;mathbb{Z}}_3' title='{&#92;mathbb{Z}}_3' class='latex' /></li>
</ul>
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