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MathGroup Archive 2009

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Re: Simplifying and Rearranging Expressions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96029] Re: Simplifying and Rearranging Expressions
  • From: John Doty <jpd at whispertel.LoseTheH.net>
  • Date: Sun, 1 Feb 2009 04:44:11 -0500 (EST)
  • References: <gls1u8$hjl$1@smc.vnet.net>

David Park wrote:

> Nevertheless, even simple rearrangement can be difficult. I sometimes think
> of it as doing surgery on expressions. I believe it is generally desirable
> to use Mathematica to rearrange an expression and not retype the expression.
> Retyping is too error prone.

In most cases, any description of how to rearrange an expression to a 
specific form in a CAS will be more complex than a retyped expression. I 
believe this is a theorem.

Therefore, in most cases, the easiest way will be to retype. It's not 
error prone if you check it, e.g.:

Simplify[ retyped == original ]

-- 
John Doty, Noqsi Aerospace, Ltd.
http://www.noqsi.com/
--
The axiomatic method of mathematics is one of the great achievements of 
our culture. However, it is only a method. Whereas the facts of 
mathematics once discovered will never change, the method by which these 
facts are verified has changed many times in the past, and it would be 
foolhardy to expect that changes will not occur again at some future 
date. - Gian-Carlo Rota


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