By the way, I have just (hopefully) given you the permissions to do these
things on the Google Code issue tracker.
Aaron Meurer
On Feb 14, 2011, at 2:10 PM, Aaron S. Meurer wrote:
> I guess you could reopen 2022. I would mark it blocked on 2026 if you think
> that issue will solve [7] and [8].
>
> Aaron Meurer
>
> On Feb 14, 2011, at 2:06 PM, Julien Rioux wrote:
>
>> 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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