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MathGroup Archive 1996

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manipulating expressions

  • To: mathgroup at
  • Subject: [mg4203] manipulating expressions
  • From: Xah Lee <xah at>
  • Date: Thu, 13 Jun 1996 23:11:12 -0400
  • Organization: Best Internet Communications
  • Sender: owner-wri-mathgroup at

A programming problem.

I have an expression, for example

(16 a^4 - 8 a^2 m^2 + m^4 - 8 a^2 n^2 + 2 m^2 n^2 + n^4 - 
  8 a^2 p^2 - 2 m^2 p^2 - 2 n^2 p^2 + p^4 - 8 a^2 q^2 - 
  2 m^2 q^2 - 2 n^2 q^2 + 2 p^2 q^2 + q^4 )

that I want to write in a concise form, namely, as a sum of a few 
products. There are many possibilities and it's tedious to form each. 
How would you write a Mathematica program that would take such an 
expression and spits out a few choicy forms for the user?

By looking at the expression in several short forms, one gains insight 
to the structure of the expression.

Thanks, and please also answer by email.

 xah at; 74631.731 at
 Mountain View, CA, USA
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