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Re: Simplifying algebraic expr: howto?

To: mathgroup@smc.vnet.net
Subject: [mg11392] Re: [mg11370] Simplifying algebraic expr: howto?
From: Sean Ross <seanross@worldnet.att.net>
Date: Sun, 8 Mar 1998 20:13:17 -0500
References: <199803070706.CAA28444@smc.vnet.net.>

Daniel G. Hyams wrote:
> 
> I apologize for the (probable) simpleness of this questions, but I am
> new to mathamatica...
> 
> I have an expression (for example):
> 
> u*(nx*u + ny*v)     ---- (1)
> 
> and a definition:
> 
> theta = nx*u+ny*v
> 
> How do I get mathematica to simplify the expression (1) such that it
> returns:
> 
> u*theta ?
> 
> ----------------------------------------------------------- Daniel G.
> Hyams
> email:  dhyams@ebicom.net
> phone:  (601) 323-4198
> -----------------------------------------------------------
In this case, use a substitution rule:

u*(nx*u + ny*v) /.( nx*u+ny*v ->theta)

returns

theta u

It appears that mathematicas rather odd canonical order puts the theta
in front of the u.  If that bothers you, someone else will have to help
you change it.  It is possible, but I don't know how. -- 
Remove the _nospam_ in the return address to respond.

References:
- Simplifying algebraic expr: howto?
  - From: "Daniel G. Hyams" <dgh2@Ra.MsState.EDU>

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