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MathGroup Archive 2001

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Re: Defining a function

  • To: mathgroup at
  • Subject: [mg28594] Re: Defining a function
  • From: Yossi Lonke <jrl16 at>
  • Date: Mon, 30 Apr 2001 03:02:05 -0400 (EDT)
  • Organization: Case Western Reserve University, Cleveland, OH, USA
  • References: <9cfrlf$>
  • Sender: owner-wri-mathgroup at

> From: yarblocks at (Jesse Marder)
To: mathgroup at
> 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

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