Mizuki Fukuda, Masaharu Ishikawa
Published 2023-04-13Version 1
A 2-sphere embedded in the 4-sphere invariant under a circle action is called a branched twist spin. A branched twist spin is constructed from a 1-knot in the 3-sphere and a pair of coprime integers uniquely. In this paper, we study, for each pair of coprime integers, if two different 1-knots yield the same branched twist spin, and prove that such a pair of 1-knots does not exist in most cases. Fundamental groups of 3-orbiolds of cyclic type are obtained as quotient groups of the fundamental groups of the complements of branched twist spins. We use these groups for distinguishing branched twist spins.
End reductions, fundamental groups, and covering spaces of irreducible open 3-manifolds
Some 3-manifold groups with the same finite quotients
The Groups $G_{n}^{k}$ and Fundamental Groups of Configuration Spaces
![QR code for arXiv:2304.06276 [math.GT]](http://oss.arxitics.com/images/favicon.svg)