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How to disable Integrate[] ?

  • To: mathgroup at
  • Subject: [mg109467] How to disable Integrate[] ?
  • From: "slawek" <slawek at>
  • Date: Wed, 28 Apr 2010 02:00:19 -0400 (EDT)
  • Organization: Telekomunikacja Polska

The input line is:

In[1]:= somethingComplicated * 
Integrate[somethingEvenMoreComplicated,{variable,a,b}] //. rules

Simplify takes about 5 minutes. And, surprise surprise, the result is still 
an Integrate[somethingElse,{anothervariable,p,q}]

It is not so bad, the integral is obviously too compound for Mathematica 
(and for me), nevertheless the the reason to use Simplify or FullSimplify is 
not to calculate Integrate[], but rather to transform 
somethingEvenMoreComplicated into somethingElse.

Is any easy way to force Mathematica to give up simplifing Integrate? And 
obviously to transform all other parts of an expression, including these 
parts which are integrated?

HoldForm nearly do this job, but "freeze" all parts of the equation. It is 
possible to "hold" only Integrate function?

(I tried replace Integrate by dummyIntegrate, i.e. an undefined function. 
But it does not work quite well.)


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