Comment #6 on issue 2552 by asmeurer: (1/(x*y)).subs(x*y, whatever) doesn't work
http://code.google.com/p/sympy/issues/detail?id=2552
...but that is a case where I really don't like the automatic algebraic logic of the current subs anyway as I've noted in other issues.
Well, that's why it needs to be configurable. Sometimes, you want to be as smart as possible, sometimes you want it to be as dumb as possible, and sometimes you want somewhere in between. That's why we have issue 2026.
It looks like I had the last crack at Mul's _eval_subs. Does somebody else want to try the next round?
I don't particularly care about this issue, but I do care about issue 2026, as it's blocking issue 2010 (my Risch stuff), so if you aren't up to fixing that one, I will take a crack at it.
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