er.. in Igusa's theta function book. On Apr 20, 10:04 am, jtyard <[email protected]> wrote: > Does anyone know how to use Sage for computations with congruence > subgroups other than Gamma, Gamma0, Gamma1 and GammaH? I need the > group Gamma(n,2n) = \{gamma in Gamma(n) : 2n | ab, 2n | cd}, as > defined in Ihara's theta function book, for odd n.
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