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MathGroup Archive 2007

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Re: Enquirey

  • To: mathgroup at smc.vnet.net
  • Subject: [mg74819] Re: Enquirey
  • From: Bill Rowe <readnewsciv at sbcglobal.net>
  • Date: Fri, 6 Apr 2007 04:24:18 -0400 (EDT)

On 4/5/07 at 4:06 AM, rayrita1 at gmail.com (Rita Ray) wrote:

>I am trying to solve two equation with two unknowns. I am using
>Mathematica 5.2.  Below is my program

<code snipped>

A few observations/comments.

Solve attempts to find a symbolic solution to a primarily a set
of *polynomial* equations. It will return symbolic answers to
some simple non-polynomial equations typically with a warning.
But general exponential equations such as you posted do not have
closed form solutions and Solve cannot solve them.

You have a syntax error in your equations. Your code was written
as expr === 0. That is incorrect. An equation in Mathematica
should have the form lhs == rhs. Two "=" characters not three.

In order to get a solution, you likely will need to use one of
the numerical routines Mathematica supplies. But to use these
you will need to set the other symbols in your equations that
are not unknowns to specific numeric values.
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