Theorem Decidable.by_contradiction

Modification history

2022-09-08 18:38
Mathlib/Init/Logic.lean
chore: bump std4 09-08 (#403) …
Deleted Decidable.by_contradictionView on Github →
2021-08-12 12:17
Mathlib/Init/Logic.lean
split out Lean 3 prelude items from Logic/Basic.lean to Init/Logic.lean (#34)
Added Decidable.by_contradictionView on Github →