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

**References**:**Can this integration be done?***From:*Daohua Song <ds2081@columbia.edu>