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MathGroup Archive 1992

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Has someone a Simplify that really simplifies?

  • To: mathgroup at yoda.physics.unc.edu
  • Subject: Has someone a Simplify that really simplifies?
  • From: p617hfa at sun24.mpifr-bonn.mpg.de (Heino Falcke)
  • Date: Tue, 15 Sep 92 10:43:25 +0200

Hi mathgroup,

Mathematica very often returns rather complex algebraic results, which
colud be simplified enormously by some simple transformations, 
grouping certain expressions and pulling out out non-numerical factors (like a x+a y +a z +w)->a (x+y+z+w/a). Using Simplify or Simplify //@ usually has only little effects althought some transformations are obvious e.g.

In[1]:= Simplify[a^2+2 a b +b^2]
               2    
Out[1]= (a + b)
In[2]:= Simplify[a^2+2 a b +b^2+x]                     (very simple example)
         2            2
Out[2]= a  + 2 a b + b  + x

Has someone a better procedure for simplifying besides applying litteral replacement rules, for example a compilation of general transformation rules (or should one start to compile such a collection).

Heino Falcke, MPIfR Bonn





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