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Commit 2020-05-13 03:44 51e2b4cc

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feat(topology/separation): add subtype.t1_space and subtype.regular (#2667) Also simplify the proof of exists_open_singleton_of_fintype

Estimated changes

Modified src/data/finset.lean

added theorem finset.filter_ssubset

Modified src/topology/separation.lean

added theorem exists_open_singleton_of_open_finset