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when toggle format what by license comment
Jan 22, 2011 at 19:53 comment added Tom Leinster A morphism e in a category is called an epimorphism if it has the right cancellation property: xe = ye implies x = y. I don't think it's as simple as "by definition".
Jan 22, 2011 at 19:20 history answered fosco CC BY-SA 2.5