Date: Dec 7, 2011 5:36 AM
Author: Chris Degnen
Subject: Re: The orde of product

I'm pretty sure this isn't what you want:

SameQ[a*b, b*a]
Unprotect[Times];
Attributes[Times] = DeleteCases[Attributes[Times], Orderless];
Protect[Times];
SameQ[a*b, b*a]


道 厚 wrote:
>
> How can I do that a*b is unequal to b*a in Mathematica 7?
> Thank you.
>