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MathGroup Archive 2007

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Re: Unexpected message 2

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73883] Re: Unexpected message 2
  • From: Bhuvanesh <lalu_bhatt at yahoo.com>
  • Date: Fri, 2 Mar 2007 06:43:25 -0500 (EST)

This should work in the next version; it's been fixed for quite some time now. Here's what I get in the development build:

In[1]:= Integrate[Cos[a*x]*CosIntegral[b*x], {x, 0, Infinity}, Assumptions -> a>b>0] //InputForm

Out[1]//InputForm= -Pi/(2*a)

In[2]:= Integrate[Cos[a*x]*CosIntegral[b*x], {x, 0, Infinity}, Assumptions -> b>a>0] //InputForm

Out[2]//InputForm= 0

In[3]:= Integrate[Cos[a*x]*CosIntegral[b*x], {x, 0, Infinity}, Assumptions -> a==b] //InputForm

Out[3]//InputForm=
If[b >= 0, -Pi/(4*b), Integrate[Cos[b*x]*CosIntegral[b*x], {x, 0, Infinity},
  Assumptions -> b < 0 && a == b]]

Sorry for the inconvenience.

Bhuvanesh,
Wolfram Research.


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