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Theorem set.countable_iff_exists_surjective_to_subtype

Modification history

2022-07-19 23:27
src/data/set/countable.lean
refactor(data/set/countable): rename some lemmas (#15527) …
Deleted set.countable_iff_exists_surjective_to_subtypeView on Github →
2020-02-05 06:25
src/data/set/countable.lean
refactor(*): migrate from `≠ ∅` to `set.nonempty` (#1954) …
Modified set.countable_iff_exists_surjective_to_subtypeView on Github →
2019-10-10 09:00
src/data/set/countable.lean
feat(topology/sequences): every first-countable space is sequential (#1528) …
Added set.countable_iff_exists_surjective_to_subtypeView on Github →