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The endomorphism ring $\End(E)$ of an elliptic curve $$E$$ is the ring of all endomorphisms of $$E$$ defined over $K$. For endomorphisms defined over extensions, we speak of the geometric endomorphism ring of $E$.

For elliptic curves defined over $\Q$, this ring is always isomorphic to $$\Z$$ consisting of the multiplication-by-$m$ maps $[m] \colon E\to E$ for $m \in \Z$.

This is a special case of the endomorphism ring of an abelian variety.

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• Review status: reviewed
• Last edited by John Voight on 2020-09-26 16:59:43
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