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MathGroup Archive 1996

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Integration Constants 2

  • To: mathgroup at
  • Subject: [mg5158] Integration Constants 2
  • From: dwint01 at (Dennis Michael Winters)
  • Date: Wed, 6 Nov 1996 01:33:52 -0500
  • Organization: Emory University
  • Sender: owner-wri-mathgroup at

I posted a message recently (Integration...Constants) that received 
several valuable responses requesting more information.  Well, here is 
the actual problem:

In[1]:=Integrate[(-2 x+ao)^-2 (-x+bo)^-1, x]

Mathematica gives the following output:

Out[1]=-(1/((ao-2 bo)(ao- 2 x))) - (Log(-bo+x)/(ao^2 - 4 ao bo + 4 bo^2)) +

Log(-ao + 2 x)/(ao^2 - 4 ao bo + 4 bo^2)

This answer is incorrect.  If performed by hand, the answer is shown to 
have positive values for ao and bo.  This is confirmed by the fact that 
this integration is a classical result of chemistry.  Years of chemical 
reaction rate analysis show the values to be positive.  Again, this 
calculation was performed using the unix version of 2.2.3.  Any help from 
those who have already responded would be most appreciated.  

-Dennis M. Winters               -
-P.O. BOX 21215                  -
-EMORY UNIVERSITY                -
-ATLANTA, GA 30322               -
-dwint01 at               -
-or winters at

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