Def Decidable.by_contradiction

Modification history

2021-08-12 12:17
Mathlib/Logic/Basic.lean
split out Lean 3 prelude items from Logic/Basic.lean to Init/Logic.lean (#34)
Deleted Decidable.by_contradictionView on Github →
2021-05-09 22:49
Mathlib/Logic/Basic.lean
feat(Logic/Basic): import init.logic
Added Decidable.by_contradictionView on Github →