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MathGroup Archive 2004

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Re: Can this integration be done?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg50118] Re: [mg50074] Can this integration be done?
  • From: DrBob <drbob at bigfoot.com>
  • Date: Sun, 15 Aug 2004 03:15:18 -0400 (EDT)
  • References: <200408140550.BAA15300@smc.vnet.net>
  • Reply-to: drbob at bigfoot.com
  • Sender: owner-wri-mathgroup at wolfram.com

Question: what's the analytic expression for Integrate[1/t,{t,1,x}]?

If you say Log[x] you're right, but what IS Log[x], and how do you compute it? Log[x] is just another name for the integral listed above; it's not a

Integrate[x/((a + x)*(b + (c + x^2)^2)), {x, 0, Infinity}]

IS an analytic expression.

A simpler form, if it exists, probably depends a lot on whether a, b, c are imaginary, complex, real, positive, negative, et cetera.

Bobby

On Sat, 14 Aug 2004 01:50:24 -0400 (EDT), Daohua Song <ds2081 at columbia.edu> wrote:

> Integrate[x/((a + x)*(b + (c + x^2)^2)),{0,Infinity}



-- 
DrBob at bigfoot.com
www.eclecticdreams.net


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