[Date Index] [Thread Index] [Author Index]

Re: Simplifying constants

• To: mathgroup at smc.vnet.net
• Subject: [mg18515] Re: Simplifying constants
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Thu, 8 Jul 1999 22:32:52 -0400
• Organization: Universitaet Leipzig
• References: <7m14k0$pg6@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

since Set[b+c+d+e,A] is nonsense I assume you mean Equal[b+c+d+e,A].
It is a matter of taste *what* you regard as simpler equations.

I use typical pattern matching to turn
a==b to a-b==0

or to exchange 
a==b to b==a.

How ever the best and unique form is to force that all your equations
are look lilke
expr == 0

Regards
  Jens
"Morten G. Dyndgaard" wrote:
> 
> Hi,
> 
> I am working with some annoyingly long equations that I want to simplify
> by including one set of parameters in a constant (or function) A, and
> another in B and so on.
> 
> You can easily do:
> 
> A = b+c+d+e
> 
> but what I want to do is the reverse:
> 
> b+c+d+e = A
> 
> and use this information to reduce the equations. Does anybody know how
> to do this?
> 
> --
> Morten G. Dyndgaard
> 
> E-mail: mgd at com.dtu.dk