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Diff — Covering space

Revision #2964 → #3484 · back to history

modifiedFactorisation of coverings (first)85b18570aaa1
FieldFrom #2964To #3484
noteNo composition lemma for `IsCoveringMap` exists; `IsCoveringMap.comp` is absent.No composition lemma for `IsCoveringMap` exists; `IsCoveringMap.comp` is absent (only `comp_homeomorph` for a homeomorphism factor).
modifiedProduct of coverings is a covering618bd3604fef
FieldFrom #2964To #3484
noteNo `Prod`-style lemma about `IsCoveringMap` exists in Mathlib.No `Prod`-style lemma about `IsCoveringMap` exists in Mathlib (loogle finds no `IsCoveringMap.prod`).