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Def direct_sum.gmonoid.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.gmonoid.of_add_subgroupsView on Github →
2021-03-15 18:15
src/algebra/direct_sum_graded.lean
feat(algebra/direct_sum_graded): a direct_sum formed of powers of a submodule of an algebra inherits a ring structure (#6550) …
Modified direct_sum.gmonoid.of_add_subgroupsView on Github →
2021-03-04 14:43
src/algebra/direct_sum_graded.lean
feat(algebra/direct_sum_graded): endow `direct_sum` with a ring structure (#6053) …
Added direct_sum.gmonoid.of_add_subgroupsView on Github →