On Thu, Aug 28, 2008 at 9:54 AM, Robert Bradshaw
<[EMAIL PROTECTED]> wrote:
>
> On Aug 27, 2008, at 1:54 PM, David Ketcheson wrote:
>
>>
>> Thanks for the nice fix. I've managed to break things in a new way:
>>
>>>>>
>> sage: from sympy import Symbol
>> sage: x,y=Symbol('x',False),Symbol('y',False)
>> sage: 1/2+y*x
>> x*y + 1/2
>> sage: y*x+1/2
>> 1/2 + y*x
>> <<<
>>
>> The 'False' argument to Symbol here means the symbols are non-
>> commutative. Adding a rational breaks this, depending on the order of
>> addition. Seems like this is more likely a Sympy bug than a Sage bug
>> though.
>
> Yes, I think this is a SimPy bug. It looks like GiNaC handles non-
> commutative symbols, so you could give that a try.
GiNaC does, but Burcin and I did not wrap that functionality
in GiNaC yet.
William
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