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math.NT2006★ 1 cited
A level N reduction theory of indefinite binary quadratic forms
Carlos Castano-Bernard
In this paper we study a geometric coding algorithm for indefinite binary quadratic forms Q for the congruence subgroup Γ^0(N), with respect to the usual fundamental domain FN, whe…
math.NT2006
Further properties of a function of Ogg and Ligozat
Carlos Castano-Bernard
Certain identities of Ramanujan may be succinctly expressed in terms of the rational function w_N(g) = w_N(f) - 1/w_N(f) on the modular curve X_0(N), where f is a certain modular u…