This was introduced in sage-5.6.beta1. On 2013-01-24 15:36, Jeroen Demeyer wrote: > While testing for speed regressions due to #12313, I actually > encountered a serious slowdown from sage-5.5 to sage-5.6: > > def test(): > for count in range(12): > for n in [2..20]: > for g in Gamma0(n).gamma_h_subgroups(): > G = g.image_mod_n() > assert G.order() == Gamma(n).index() / g.index() > > time test() > > > The time for this went up from around 30s to 80s.
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