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Epic/epimorphism; isomorphism

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Epic/epimorphism; isomorphism

Maybe the article could mention that many authors in category theory use the term "epimorphism" as synonymous with "epic" and not with "onto homomorphism". So a term such as "ring epimorphism" is in general ambiguous.

Also, an isomorphism is not just a bijective homomorphism, but a homomorphism which has a homomorphism as an inverse. (In most, but not all, cases this is the same).

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