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Theorem
cardinal.countable_iff_lt_aleph_one
Modification history
2022-06-22 18:31
src/set_theory/cardinal/ordinal.lean
refactor(data/set/countable): make `set.countable` protected (#14886) …
Modified
cardinal.countable_iff_lt_aleph_one
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2021-05-15 08:16
src/set_theory/cardinal_ordinal.lean
feat(counterexamples): a counterexample on the Pettis integral (#7553) …
Added
cardinal.countable_iff_lt_aleph_one
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