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Re: Non-Commutative calculations in Calc, Revisited


From: Jay Belanger
Subject: Re: Non-Commutative calculations in Calc, Revisited
Date: Thu, 06 Oct 2005 08:16:15 -0500
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

Neon Absentius <absent@sdf.lonestar.org> writes:

> When in non-commutative (aka `matrix') mode calc calculates 
> (a b)^-1 to be a^-1 b^-1 instead of the correct b^-1 a^-1.
>
> Actually there is a more general bug.  It calculates (a b)^n 
> to be a^n b^n.  I think this rule should be removed when a and 
> be don't commute.  Furthermore a special rule should be included 
> that deals with the case n=-1. 

Yes; you're right.
Fixes should be commited to cvs tomorrow afternoon at the latest.

Thanks,
Jay


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