Betti numbers of Shimura curves and arithmetic three--orbifolds

preprint2018arXivOpen access

Abstract

We show that asymptotically the first Betti number, or the arithmetic genus, of a Shimura curve satisfies the Gauss--Bonnet equality. We also show that the first Betti number of a congruence hyperbolic 3--orbifold asymptotically vanishes relatively to hyperbolic volume.

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