some Orlik-Raymond circle bundles over orbifolds


and are surface-bundles over the circle too. These are the first examples

\bullet

S^2\stackrel{\sim}\times S^1=\{0;(Oo,0,0,1);(1,0)\}
=\{0;(Oo,0,0,1);(a_1,b_1)\} with a_1 odd
\qquad=\{1;(NnI,1,0,0);(1,0)\}

\bullet

N_1\times S^1=\{0;(NnI,1,0,0);(1,0)\}
\qquad=\{0;(Oo,0,0,1);(a_1,b_1)\} with a_1 even

\bullet

N_2\times S^1=\{0;(Oo,0,0,2);(1,0)\}

\bullet

N_2\times_t S^1=\{0;(NnI,1,0,2);(1,0)\}

\bullet

N_2\times_{ty} S^1=\{0;(On,1,0,1);(1,0)\}

\bullet

N_3\times_{-1} S^1=\{0;(On,2,0,1);(1,0)\}

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