# Def direct_sum.gcomm_monoid.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.gcomm_monoid.of_add_subgroupsView on Github →