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Theorem cardinal.eq_one_iff_subsingleton_and_nonempty

Modification history

2021-05-18 04:50
src/set_theory/cardinal.lean
feat(logic/is_empty): Add is_empty typeclass (#7606) …
Deleted cardinal.eq_one_iff_subsingleton_and_nonemptyView on Github →
2019-12-03 16:50
src/set_theory/cardinal.lean
feat(set_theory/cardinal): eq_one_iff_subsingleton_and_nonempty (#1770) …
Added cardinal.eq_one_iff_subsingleton_and_nonemptyView on Github →