Mathlib v3 is deprecated. Go to Mathlib v4

Theorem category_theory.subgroupoid.ker_is_normal

Modification history

2022-10-27 07:38
src/category_theory/groupoid/subgroupoid.lean
chore(category_theory/groupoid/*) More subgroupoid lemmas (#17147) …
Added category_theory.subgroupoid.ker_is_normalView on Github →