Theorem Set.insert_diff_self_of_mem

Modification history

2025-08-11 13:56
Mathlib/Order/BooleanAlgebra/Set.lean
feat(Finset): `insert a (s \ {a}) = s` if `a ∈ s` (#28172) …
Modified Set.insert_diff_self_of_memView on Github →
2025-07-05 02:43
Mathlib/Data/Set/Insert.lean
chore(Data/Set/Image): move `BooleanAlgebra` material to `Order` (#26763) …
Modified Set.insert_diff_self_of_memView on Github →
2025-02-09 06:38
Mathlib/Data/Set/Basic.lean
chore(Data/Set/Basic): split `insert` / `singleton` / `pair` to new file (#21567) …
Modified Set.insert_diff_self_of_memView on Github →
2025-01-20 15:19
Mathlib/Data/Set/Basic.lean
feat: the pairs `{t, insert a t}` are pairwise disjoint (#20062) …
Added Set.insert_diff_self_of_memView on Github →