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A level N reduction theory of indefinite binary quadratic forms

Carlos Castano-Bernard

math.NTarXiv:math/0603149

Abstract

In this paper we study a geometric coding algorithm for indefinite binary quadratic forms Q for the congruence subgroup Γ0(N), with respect to the usual fundamental domain FN, where N is assumed prime. The cycles Q1, . . ., Qn that this algorithm produces are such that the the corresponding paths γ1, . . ., γn in the Riemann surface X0(N)(C) have a nice behavior around the elliptic points of order 2.

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