Abstract
A regular circle-valued Morse function on the knot complement is a function which separates critical points and which behaves nicely in a neighborhood of the knot. Such a function induces a handle decomposition on the knot exterior , with the property that every regular level surface contains a Seifert surface for the knot. We rearrange the handles in such a way that the regular surfaces are as “simple" as possible. To make this precise the concept of circular width for is introduced. When is endowed with a handle decomposition which realizes the circular width we will say that the knot is in circular thin position. We use this to show that many knots have more than one nonisotopic incompressible Seifert surface. We also analyze the behavior of the circular width under some knot operations.
Citation
Fabiola Manjarrez-Gutiérrez. "Circular thin position for knots in $S^3$." Algebr. Geom. Topol. 9 (1) 429 - 454, 2009. https://doi.org/10.2140/agt.2009.9.429
Information