Comment #38 on issue 1358 by wflynny: (e*f*e*f).subs(e*f,f*e+h) fails if
e*f is not commutative
http://code.google.com/p/sympy/issues/detail?id=1358
That's weird because I just did that and got the right answer. I know that
the patch
fails mostly in areas that bring in polynomial decomposition. That's why
some of
those integral tests fail.
Here's what I got:
In [1]: import sympy as sp
In [2]: x,y=sp.symbols('xy')
In [3]: ((x*y)**2).subs(x*y,2)
Out[3]: 4
In [4]: w,z=sp.symbols('wz')
In [5]: ((w*z)**2).subs(w*z,2)
Out[5]: 4
In [6]: w,z=sp.symbols('wz',commutative=False)
In [7]: ((w*z)**2).subs(w*z,2)
Out[7]: 4
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