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Commit 2021-04-08 05:45 def96711

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feat(group_theory/is_free_group): the property of being a free group (#7086)

Estimated changes

Created src/group_theory/is_free_group.lean

added theorem is_free_group.end_is_id

added theorem is_free_group.eq_lift'

added def is_free_group.iso_free_group_of_is_free_group

added def is_free_group.lift'

added theorem is_free_group.lift'_of

added def is_free_group.of_mul_equiv

added theorem is_free_group.unique_lift'