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A simple abelian variety $A$ is said to be of $\textbf{GL}_2$-type if the dimension of its endomorphism algebra $\mathrm{End}(A)\otimes\Q$ (as a $\Q$-vector space) is equal to the dimension of $A$ (as an abelian variety); a non-simple abelian variety is of $\textrm{GL}_2$-type if it is isogenous to a product of pairwise non-isogenous simple abelian varieties of $\textrm{GL}_2$-type.

A curve is said to be of $\text{GL}_2$-type if its Jacobian is of $\text{GL}_2$-type.

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• Review status: reviewed
• Last edited by John Cremona on 2018-05-24 17:11:43
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