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Simplifying complicated expressions
 To: mathgroup at smc.vnet.net
 Subject: [mg110161] Simplifying complicated expressions
 From: "S. B. Gray" <stevebg at ROADRUNNER.COM>
 Date: Sat, 5 Jun 2010 07:31:08 0400 (EDT)
 Replyto: stevebg at ROADRUNNER.COM
Suppose I have a long complex expression in which terms like
(x^2+y^3x^2y^2+Sqrt[z3+y2]) (for a simple example) appear many times
along with various powers and the reciprocals of it, etc. To make the
expression comprehensible and to make the computation faster, I would
like to substitute say "f1xyz" for it everywhere it appears. The normal
/. and > substitutions and patterns are not adequate for this. Of
course at evaluation time I want to compute f1xyz only once and not have
the final formula revert to the original variables. How do I prevent that?
Also a welcome addition to Mathematica would be the ability to find these
repeated expressions automatically and put them in, because doing it
manually is very errorprone and slow.
Tips will be appreciated!
Steve Gray
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