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Cut numbers of -manifolds
Authors:Adam S Sikora
Institution:Department of Mathematics, 244 Mathematics Building, SUNY at Buffalo, Buffalo, New York 14260
Abstract:We investigate the relations between the cut number, $c(M),$ and the first Betti number, $b_1(M),$ of $3$-manifolds $M.$ We prove that the cut number of a ``generic' $3$-manifold $M$ is at most $2.$ This is a rather unexpected result since specific examples of $3$-manifolds with large $b_1(M)$ and $c(M)\leq 2$ are hard to construct. We also prove that for any complex semisimple Lie algebra $\mathfrak g$ there exists a $3$-manifold $M$ with $b_1(M)=dim\, \mathfrak g$ and $c(M)\leq rank\, \mathfrak g.$ Such manifolds can be explicitly constructed.

Keywords:Cut number  3-manifold  corank  skew-symmetric form  cohomology ring
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