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Commit 2020-12-14 13:16 67b5ff6f

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feat(algebra/direct_sum): constructor for morphisms into direct sums (#5204)

Estimated changes

Modified src/algebra/direct_sum.lean

added def direct_sum.from_add_monoid

added theorem direct_sum.from_add_monoid_of

added theorem direct_sum.from_add_monoid_of_apply

Modified src/algebra/group/hom.lean