Dear list,
I found some more problems when using non-commutative symbols and subs
and I wonder if I should reopen issue 2022 or open a new issue?
In [1]: import sympy
In [2]: print sympy.__version__
0.6.7-git
In [3]: sympy.var('a b c')
Out[3]: (a, b, c)
In [4]: A=sympy.Symbol('A', commutative=False)
In [5]: B=sympy.Symbol('B', commutative=False)
In [6]: (a*A).subs(a*a*A,B)
Out[6]: a*B
In [7]: (A*A).subs(A*A*A,c)
Out[7]: c**(2/3)
In [8]: (A*A*A).subs(A*A,c)
Out[8]: c**(3/2)
In [6] and [7] no substitution should occur, in [8] c*A should be the result.
[7] and [8] are related to issue 2026, but it's different in that with
non-commutative symbols, it is simply wrong to do algebraic
substitution.
--
Julien
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