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301.10D Properties of Homomorphisms, Image, Kernel
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GIving up bijection doesn't mean giving up hope. Homomorphisms, like isomorphisms, also send identity to identity, powers to powers, and inverses to inverses. BUT, we also show that the image of a homomorphism is a SUBGROUP of its target group, and — most importantly of all! — the kernel of a homomorphism is a NORMAL SUBGROUP of its domain group
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