Mathlib v3 is deprecated. Go to Mathlib v4

Theorem set.ncard_le_one_iff_subset_singleton

Modification history

2023-05-30 14:04
src/data/set/ncard.lean
feat(data/set/ncard): noncomputable set cardinality (#18576) …
Added set.ncard_le_one_iff_subset_singletonView on Github →