Theorem Set.subsingleton_of_subsingleton

Modification history

2025-10-06 15:37
Mathlib/Data/Set/Subsingleton.lean
feat(Data/Set/Subsingleton): added new lemma `Subsingleton.union_subsingleton` along with some trivial code cleanup (#29955)
Modified Set.subsingleton_of_subsingletonView on Github →
2024-04-18 05:39
Mathlib/Data/Set/Basic.lean
chore: split `Subsingleton,Nontrivial` off of `Data.Set.Basic` (#11832) …
Modified Set.subsingleton_of_subsingletonView on Github →
2022-12-12 01:34
Mathlib/Data/Set/Basic.lean
feat: port Data.Set.Basic (#892) …
Added Set.subsingleton_of_subsingletonView on Github →