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An endomorphism of an abelian variety is a morphism from the variety to itself. The set of endomorphisms of an abelian variety $A$ form a ring in which addition is defined point-wise (using the group operation of $A$) and multiplication is composition; this is the endomorphism ring of $A$, denoted $\textrm{End}(A)$.

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• Last edited by John Cremona on 2018-06-18 12:01:44
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