Automatic continuity for homeomorphism groups of noncompact manifolds

preprint2020arXivOpen access

Abstract

We extend the proof of automatic continuity for homeomorphism groups of manifolds to non-compact manifolds and manifolds with marked points and their mapping class groups. Specifically, we show that, for any manifold MM homeomorphic to the interior of a compact manifold, and a set X⊂MX \subset M homeomorphic to the union of a Cantor set and finite set, the relative homeomorphism group Homeo(M,X)\mathrm{Homeo}(M, X) and the mapping class group Homeo(M,X)/Homeo0(M,X)\mathrm{Homeo}(M, X)/\mathrm{Homeo}_0(M,X) have the property that any homomorphism from such a group to any separable topological group is necessarily continuous.

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