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RE: Can you help me to solve this Integrate using Mathematica ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg36256] RE: [mg36221] Can you help me to solve this Integrate using Mathematica ?
  • From: "DrBob" <drbob at bigfoot.com>
  • Date: Wed, 28 Aug 2002 04:16:17 -0400 (EDT)
  • Reply-to: <drbob at bigfoot.com>
  • Sender: owner-wri-mathgroup at wolfram.com

Mathematica version 4.2 has no problem with this one.   All you have to
do is spell things correctly.

Integrate[Exp[-a/x]/(x^2 - b^2), {x, 0, Infinity}]

If[Re[a] > 0 && Arg[b^2] != 
    0, (1/2)*Sqrt[-(1/b^2)]*
   (2*CosIntegral[
      a*Sqrt[-(1/b^2)]]*
     Sin[a*Sqrt[-(1/b^2)]] + 
    Cos[a*Sqrt[-(1/b^2)]]*
     (Pi - 2*SinIntegral[
        a*Sqrt[-(1/b^2)]])), 
  Integrate[1/(E^(a/x)*
     (-b^2 + x^2)), 
   {x, 0, Infinity}]]

Bobby Treat

-----Original Message-----
From: Valdeci Pereira Mariano de Souza [mailto:vpms at rc.unesp.br] 
To: mathgroup at smc.vnet.net
Subject: [mg36256] [mg36221] Can you help me to solve this Integrate using
Mathematica ?

Dear Group

I would like to know, if is possible to solve

Integrate[(exp[-a/x])/(x^2-b^2),{x,0,infinity}] with

a and b constant ( Real )

using Mathematica.


Thankfully,


Valdeci Mariano


*********************************************************************
Valdeci Mariano de Souza
Master´s Degree of Applied Physics  -  Unesp/Rio Claro - State of São
Paulo - Brazil
Laboratory of Electrical Measurements
email : vpms at rc.unesp.br   or   valdecimariano at bol.com.br
phone : ( 0XX19 ) 526 - 2237
*********************************************************************








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