feat(algebra/group/hom): cancel injective/surjective monoid_homs
#2112
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jcommelin
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…eanprover-community#2112) * feat(algebra/group/hom): cancel injective/surjective `monoid_hom`s * Add a `ring_hom` version Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
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May 16, 2020
…eanprover-community#2112) * feat(algebra/group/hom): cancel injective/surjective `monoid_hom`s * Add a `ring_hom` version Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
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