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This is a report on recent work, with Wen-Ching Winnie Li and Ling Long. In that work explicit formulas are given, involving hypergeometric character sums, for the traces of Hecke operators Tₚ acting spaces of cusp forms Sₖ () of weight k for certain arithmetically defined Fuchsian subgroups SL₂ (R). In particular we consider the groups attached to the quaternion division algebra B₆ over Q of discriminant 6.
Hoffman et al. (Mon,) studied this question.
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