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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_oneView on Github →
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_oneView on Github →