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Creators/Authors contains: "Khare, Chandreshekhar"

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  1. null (Ed.)
    Let $$A_1$$ and $$A_2$$ be abelian varieties over a number field $$K$$. We prove that if there exists a non-trivial morphism of abelian varieties between reductions of $$A_1$$ and $$A_2$$ at a sufficiently high percentage of primes, then there exists a non-trivial morphism $$A_1\to A_2$$ over $$\bar K$$. Along the way, we give an upper bound for the number of components of a reductive subgroup of $$GL_n$$ whose intersection with the union of $$Q$$-rational conjugacy classes of $$GL_n$$ is Zariski-dense. This can be regarded as a generalization of the Minkowski-Schur theorem on faithful representations of finite groups with rational characters. 
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