Mathlib v3 is deprecated. Go to Mathlib v4

Def direct_sum.ghas_one.to_sigma_has_one

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_one.to_sigma_has_oneView 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.ghas_one.to_sigma_has_oneView on Github →