Le mercredi 4 juillet 2012 06:50:24 UTC-4, David Loeffler a écrit : > > > On 4 July 2012 03:05, Maarten Derickx <m.derickx.stud...@gmail.com> > wrote: > >> Dear All, > >> > >> Today I was trying to compute some stuff using modular symbols. And I > found > >> the following slightly worrying: > > Yup, this is definitely a bug. The "old submodule" it calculates isn't > Hecke-invariant: > > sage: M.hecke_matrix(17).restrict(S.old_submodule().free_module()) > [...] > ArithmeticError: subspace is not invariant under matrix > > Note that S.old_submodule().hecke_matrix() will return something, but > it'll be garbage, because it's restricting a matrix to a non-invariant > submodule with checks disabled. > > Maarten, can you open a ticket for this? > > Yup: http://trac.sagemath.org/sage_trac/ticket/13198 . I can't promise to work on it very soon though since I also have a lot of stuff to do right now.
David > -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
