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Theorem is_open_iff_nhds

Modification history

2020-06-25 12:26
src/topology/basic.lean
feat(filter, topology): cluster_pt and principal notation, redefine compactness (#3160) …
Modified is_open_iff_nhdsView on Github →
2019-11-12 11:23
src/topology/basic.lean
style(*): use notation `𝓝` for `nhds` (#1582) …
Modified is_open_iff_nhdsView on Github →
2017-12-07 00:39
analysis/topology/topological_space.lean
refactor(*): remove local simp AC lemmas …
Modified is_open_iff_nhdsView on Github →
2017-08-10 16:41
topology/topological_space.lean
rename open -> is_open, closed -> is_closed
Added is_open_iff_nhdsView on Github →