> For some reason SR eigenvectors were never actually tested, I think -
> because they inherit directly from matrix2.pyx!  In fact, the error
> comes from eigenspaces_left in that file, where G = self.fcp() calls
> degree of a symbolic expression, which now requires an argument ! The
> symbolic upgrade strikes again...  I'll try to have a patch for this
> soon.

As it turns out, there is actually a lot of stuff which now does not
work with symbolic matrices, because we only tested the things which
were actually implemented for them.  See 
http://trac.sagemath.org/sage_trac/ticket/6934,
which I've labeled critical.  Suggestions for how to approach the
fix?

- kcrisman
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