Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 2022 by julien.rioux: inconsistent behaviour of subs when using
non-commutative symbols
http://code.google.com/p/sympy/issues/detail?id=2022
Using .subs(), what works with commutative symbols doesn't as soon as one
non-commutative symbol appears in the expression.
Steps to reproduce:
In [1]: import sympy
In [2]: print sympy.__version__
0.6.7-git
In [3]: sympy.var('a b c A')
Out[3]: (a, b, c, A)
In [4]: (a*b*A).subs(a*b,c)
Out[4]: A*c
In [5]: A=sympy.Symbol('A',commutative=False)
In [6]: (a*b*A).subs(a*b,c)
Out[6]: a*b*A
Expected: Out[6] to be identical as Out[4]
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