# Def direct_sum.ghas_mul.of_add_subgroups

#### Modification history

2021-10-08 14:22

src/algebra/direct_sum/ring.lean

feat(algebra/graded_monoid): Split out graded monoids from graded rings (#9586) …

Deleted direct_sum.ghas_mul.of_add_subgroupsView on Github →2021-03-30 14:01

src/algebra/direct_sum_graded.lean

chore(algebra/direct_sum_graded): relax typeclass assumptions (#6961)

Modified direct_sum.ghas_mul.of_add_subgroupsView on Github →