[GiNaC-devel] Matrices vs indexed [Was: Fixes w.r.t. indexed objects]

[Sheplyakov Alexei]

Hello!
On Sat Jul 29 00:36:24 CEST 2006, Chris Dams wrote:
> Another thing:
> What is the idea of the answer to the question "I wish to mix matrices and 
> indexed objects. How can that be done?"?

My idea was to explain that tensors (`indexed') and matrices/arrays are
fundamentally different. People don't seem to realize that, see, e.g.

http://www.ginac.de/pipermail/ginac-list/2005-June/000667.html
http://www.cebix.net/pipermail/ginac-list/2004-December/000576.html

> I see a very strange expression there with three indices that are apparently
> contracted. However, we don't want to encourage our users to start typing
> that kind of garbage, do we?

But even GiNaC developers *do* write such things, see:
http://thep.physik.uni-mainz.de/pipermail/ginac-list/2005-April/000638.html
 

Best regards,
 Alexei.

-- 
All science is either physics or stamp collecting.

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