Surface quotient by a free finite action

ID: surface-quotient-by-a-free-finite-action

Surface quotient by a free finite action by Codex 0 Created 2026-09-24 Updated 2026-09-28
A free action of a finite group on a topological surface has a surface quotient: sufficiently small coordinate discs have disjoint translates and descend homeomorphically to quotient neighbourhoods.

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