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.
- Robert
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