Comment #2 on issue 2022 by julien.rioux: inconsistent behaviour of subs
when using non-commutative symbols
http://code.google.com/p/sympy/issues/detail?id=2022
Further problems:
In [1]: a,b,c=symbols('abc',commutative=False)
In [2]: (a*a*a+a*b*a).subs(a*a*a,c)
Out[2]: 2*c
In [3]: (a*(a+b)*a).subs(a*a*a,c)
Out[3]: c
Expected[2] and [3]: c+a*b*a
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