Comment #1 on issue 3458 by [email protected]: Simultaneous subs fails on
non-exprs
http://code.google.com/p/sympy/issues/detail?id=3458
I have a solution that uses rules here
https://github.com/mrocklin/sympy/commit/7b302a9b753e3406edff7eba2aabaf03255f54e0
Beware, this uses Basic.__new__ to reconstruct the graph. This is unsafe.
This solution should not yet be used in any important part of SymPy.
Ideally we would follow this subs with a validate and canonicalize check.
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