Status: Accepted
Owner: ----
Labels: Type-Defect Priority-High Milestone-Release0.6.5

New issue 1358 by ondrej.certik: (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

>>> e,f,h=symbols('efh',commutative=False)

>>> (e*f).subs(e*f,f*e+h)
h + f*e
>>> (e*f*e*f).subs(e*f,f*e+h)
e*f*e*f

I tried to check the help(Symbol) and I couldn't find anything useful.
I would like to know if there is a good way to do it.


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