Work

Non-planar Ends are Continuously Unforgettable

Year: 2025

Type: article

Abstract: We show that continuous epimorphisms between a class of subgroups of mapping class groups of orientable infinite-genus 2-manifolds with no planar ends are always induced by homeomorphisms. This class of subgroups includes the pure mapping class group, the closure of the compactly supported mapping classes, and the full mapping class group in the case that the underlying manifold has a finite number of ends or is perfectly self-similar. As a corollary, these groups are Hopfian topological groups.

Source: International Mathematics Research Notices

DOI: 10.1093/imrn/rnaf026

Authors: Javier Aramayona, Rodrigo de Pool, Rachel Skipper, Jing Tao, Nicholas G Vlamis, Xiaolei Wu