Comment #5 on issue 2516 by [email protected]: Bug on collect()
http://code.google.com/p/sympy/issues/detail?id=2516
The case of the variables controls the order that terms are processed in.
An even simpler failing example is:
>>> e=(D**3*a + b*u**3)/Re
>>> collect(e.subs(u,aA).expand(),[aA**3/Re, a])
D**3*a + aA**3*b/Re
Note that the Re divisor is missing from the first term.
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