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Theorem subgroup.center_normal

Modification history

2020-09-11 15:53
src/group_theory/subgroup.lean
cleanup(group_theory/presented_group): () -> [], and remove some FIXMEs (#4076)
Deleted subgroup.center_normalView on Github →
2020-06-05 05:31
src/group_theory/subgroup.lean
feat(group_theory/subgroup): define normal bundled subgroups (#2947) …
Added subgroup.center_normalView on Github →