Hi there,
I'm close to solve: #8276 Make the one(), identity_matrix() and zero_matrix()
cached and immutable. Correcting MatrixSpace is easy, however there are a lot
of place in sage where people create a matrix from the one or zero and modify
it after that. I nearly corrected all these occurences However I'm stuck with
those three files which are very complicated and depend one of each other:
sage/modular/quatalg/brandt.py
sage/algebras/quatalg/quaternion_algebra.py
sage/schemes/elliptic_curves/heegner.py
There are a lot of error but I can't find where it's coming from. I really
could use the help of a specialist. The patch are on
http://trac.sagemath.org/sage_trac/ticket/8276
Apply them it the following order:
trac_8276-MatrixSpace_one-fh.patch
trac_8276-fix_sagelib-fh.patch
Thanks for any suggestion.
Cheers,
Florent
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