Abstract
In a series of lectures Selberg introduced a trace formula on the space of hybrid Maass-modular forms of an irreducible uniform lattice in PSL 2 ( R ) n . In this paper we derive the analogous formula for a non-uniform lattice and use it to study the distribution of elliptic–hyperbolic conjugacy classes. In particular, for Hilbert modular groups there is a nice interpretation of these results in terms of class numbers and fundamental units of quadratic forms over totally real number fields.
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