Theorem ZFSet.IsOrdinal.not_mem_iff_subset

Modification history

2024-12-15 00:44

Mathlib/SetTheory/ZFC/Ordinal.lean

feat(SetTheory/ZFC/Ordinal): Alternate characterizations of ordinals (#17001) …

Added ZFSet.IsOrdinal.not_mem_iff_subset View on Github →