Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-03-09 00:56 ca370cb9

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fix(deprecated/group): remove dangerous instances (#2096)

Estimated changes

Modified src/deprecated/group.lean

added theorem additive.is_add_group_hom

added theorem additive.is_add_hom

added theorem additive.is_add_monoid_hom

added theorem multiplicative.is_group_hom

added theorem multiplicative.is_monoid_hom

added theorem multiplicative.is_mul_hom

Modified src/group_theory/quotient_group.lean

Modified src/group_theory/subgroup.lean

added theorem additive.is_add_subgroup

added theorem additive.normal_add_subgroup

modified def is_group_hom.ker

modified theorem is_group_hom.mem_ker

added theorem multiplicative.is_subgroup

added theorem multiplicative.normal_subgroup