Re: Defining a function
- To: mathgroup at smc.vnet.net
- Subject: [mg28594] Re: Defining a function
- From: Yossi Lonke <jrl16 at po.cwru.edu>
- Date: Mon, 30 Apr 2001 03:02:05 -0400 (EDT)
- Organization: Case Western Reserve University, Cleveland, OH, USA
- References: <9cfrlf$gmd@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
> From: yarblocks at yahoo.de (Jesse Marder)
To: mathgroup at smc.vnet.net
> Organization: Steven M. Christensen and Associates, Inc and MathTensor, Inc.
> Newsgroups: comp.soft-sys.math.mathematica
> Date: 28 Apr 2001 21:44:15 -0400
> Subject: [mg28594] Defining a function
>
> Hello.
>
> I have for example:
>
> a = x + y and
> b = x*y
>
> whats the procedure to express b as a function of a in Mathematica?
>
> Thank you.
> Jesse.
>
The pairs {1,6}, {2,5} have the same sum but different products,
so x*y is NOT a function of (x+y).
But you were probably not concerned with such details -- what you
want is a method of solving a system of non-linear equations. You
may want to look into Mathematica's built in Solve method, and
investigate the possibilites there.
Yossi Lonke