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Theorem semiring.direct_sum_mul

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 semiring.direct_sum_mulView on Github →
2021-05-05 18:50
src/algebra/direct_sum_graded.lean
feat(algebra/direct_sum_graded): a direct_sum of copies of a ring is itself a ring (#7420) …
Added semiring.direct_sum_mulView on Github →