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Shimura subgroups of Jacobians of Shimura curves
Given an indefinite quaternion algebra of reduced discriminant D and an integer N relatively prime to D, one can construct Shimura curves Sh0(N, D) and Sh1(N, D), which are analogues of X0(N) and X1(N). The natural morphism ...
Congruences between cusp forms and the geometry of Jacobians of modular curves
Abstract not available in fulltext.