Surgery on a knot in (surface \(\times I\)).

*(English)*Zbl 1197.57011In the paper under review the authors prove a generalisation of two results which follow from work of D. Gabai [Topology 28, No.1, 1-6 (1989; Zbl 0678.57004)]. Roughly speaking, Gabai proved that if \(A\) is an annulus and \(K\) is a knot in \(A\times I\) such that after a nontrivial Dehn surgery on \(K\) the annulus \(A\times \{ 0\} \) compresses, then \(K\) is parallel in \(A\times I\) to the core curve \(\alpha\) of \(A\times \{0\}\) and the annulus that describes the parallelism determines the slope of the Dehn surgery. He also proved a similar result considering a torus. The generalisation says the following: Suppose \(F\) is a compact orientable surface, \(K\) a knot in \(F \times I\), and \((F\times I)_{surg} \) is the 3-manifold obtained by some nontrivial surgery on \(K\). If \(F\times \{0\}\) compresses in \((F\times I)_{\text{surg}}\) then \(K\) is parallel to an essential simple closed curve in \(F\times \{0\}\). Moreover, the annulus that describes the parallelism determines the slope of the surgery. Also, as an application the authors prove that if \((F\times I)_{\text{surg}}\) is reducible then either \(K\) lies in a 3-ball, or \(K\) is cabled and the surgery slope is that of the cabling annulus, or \(F\) is a torus, \(K\) is parallel to an essential simple closed curve in \(F\times \{0\}\), and the annulus that describes the parallelism determines the surgery slope.

Reviewer: Lorena Armas-Sanabria (Mexico)

##### MSC:

57M25 | Knots and links in the \(3\)-sphere (MSC2010) |

57M27 | Invariants of knots and \(3\)-manifolds (MSC2010) |

57N10 | Topology of general \(3\)-manifolds (MSC2010) |

##### References:

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