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An endomorphism of an elliptic curve defined over a field $K$ is a homomorphism $\varphi\colon E\to E$ defined over $K$. The set of all endomorphisms of $E$ forms a ring called the endomorphism ring of $E$, denoted $\End(E)$, a special case of the endomorphism ring of an abelian variety.

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• Last edited by John Voight on 2020-09-26 17:01:15
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