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Re: Recognize vector expression

  • To: mathgroup at smc.vnet.net
  • Subject: [mg91118] Re: Recognize vector expression
  • From: rych <rychphd at gmail.com>
  • Date: Wed, 6 Aug 2008 05:08:37 -0400 (EDT)
  • References: <g725lm$n3g$1@smc.vnet.net> <g76akn$db4$1@smc.vnet.net>

On Aug 4, 8:20 am, Fred Klingener <jfklinge... at gmail.com> wrote:
> On Aug 2, 1:31 pm, "Ramiro dell'Erba" <delle... at casaccia.enea.it>
> wrote:
>
> > Dear Mathematica friends,
> > I have the following problem. Working in tensorial algebra I
> > wondering if exist a package of rules able to a "clever" managing of
> > the vector components. As example able to recognize that {-b3c2+b2c3,
> > b3c1+b1c3, -b2c1+b1c2} is Cross[b,c] and many others to a better
> > lecture of long expression. A simple rule, just for this, is not
> > enough, I need a package the contain all!
>
> So far, I've fumbled along, making up replacement rules for symbolic
> expressions like cross, the triple products, and some quaternion
> forms. They're ad hoc, some require special forms of definitions, and
> they have to be explicitly applied. They work, but they are not
> satisfactory, and none are what I would call ready to be packaged.
>
> Should we start writing function paclets?
>
> Cheers,
> Fred Klingener

Take a look at Tensorial on David Park's website. It does facilitate
simplification of tensor expressions.


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