Comment #11 on issue 2265 by [email protected]: cse requires subexpressions
to be in the exact same order
http://code.google.com/p/sympy/issues/detail?id=2265
Let me know what you think about the mods, Andy... I don't do any canonical
ordering of the replacements. (I'm not sure when that would be necessary.)
So in one case x - y may come first and in another, y - x:
h[2] >>> cse([(x-y), (y-x)*(x-y), z*(y-x)])
([(x0, x - y), (x1, y - x)], [x0, x0*x1, x1*z])
h[3] >>> cse([a*(y-x), (x-y), (y-x)*(x-y), z*(y-x)])
([(x0, y - x), (x1, x - y)], [a*x0, x1, x0*x1, x0*z])
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