Theorem TopologicalSpace.Closeds.isOpen_inter_nonempty_of_isOpen

Modification history

2025-11-20 20:06
Mathlib/Topology/UniformSpace/Closeds.lean
feat(Topology/UniformSpace): define the Hausdorff uniformity (#31031) …
Added TopologicalSpace.Closeds.isOpen_inter_nonempty_of_isOpenView on Github →