Comment #2 on issue 2265 by [email protected]: cse fails for multiplication
http://code.google.com/p/sympy/issues/detail?id=2265
(sorry whereas)
cse only looks for repeated args, not sub-args, so a*c is never seen as an
arg in a*b*c -- to detect such a thing would require checking whether a*c
could make a replacement in any already seen arg. That's going to be slower
but it could be done.
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