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Theorem presented_group.to_group.inv

Modification history

2020-09-11 15:53
src/group_theory/presented_group.lean
cleanup(group_theory/presented_group): () -> [], and remove some FIXMEs (#4076)
Deleted presented_group.to_group.invView on Github →
2019-06-10 13:38
src/group_theory/presented_group.lean
feat(group_theory/presented_group): define presented groups (#1118) …
Added presented_group.to_group.invView on Github →