Non-realizability of some big mapping class groups

preprint2022arXivOpen access

Abstract

In this note, we prove that the compactly supported mapping class group of a surface containing a genus 33 subsurface has no realization as a subgroup of the homeomorphism group. We also prove that for certain surfaces with order 66 symmetries, their mapping class groups have no realization as a subgroup of the homeomorphism group. Examples of such surfaces include the plane minus a Cantor set and the sphere minus a Cantor set.

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