Comment #3 on issue 2516 by [email protected]: Bug on collect()
http://code.google.com/p/sympy/issues/detail?id=2516
As noted in the discussion, the wrong result is obtained when 'u' below is
replaced with a variable that starts with a lower case letter:
>>> e
(D**3*a + D**3*b + a*u**3 + b*u**3)/Re
>>> for aa in [A, AA, Aa, aaA, aAa, aA, c]:
... print aa, collect(e.subs(u, aa).expand(), [aa**3/Re, D**3])
...
A A**3*(a + b)/Re + D**3*(a/Re + b/Re)
AA AA**3*(a + b)/Re + D**3*(a/Re + b/Re)
Aa Aa**3*(a + b)/Re + D**3*(a/Re + b/Re)
^
[space inserted for clarity; compare first term below with last term above]
V--------------/
aaA D**3*(a + b) + aaA**3*(a + b)/Re
aAa D**3*(a + b) + aAa**3*(a + b)/Re
aA D**3*(a + b) + aA**3*(a + b)/Re
c D**3*(a + b) + c**3*(a + b)/Re
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