Re: Can this integration be done?

*To*: mathgroup at smc.vnet.net*Subject*: [mg50134] Re: Can this integration be done?*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Tue, 17 Aug 2004 05:00:54 -0400 (EDT)*Organization*: Universitaet Leipzig*References*: <cfk9ub$f69$1@smc.vnet.net>*Reply-to*: kuska at informatik.uni-leipzig.de*Sender*: owner-wri-mathgroup at wolfram.com

Hi, try to find out why a=b=c=-1 end up at infinity and find out what happens when a are somewhere the complex plane but not at the negative real axis. You havt to look for the zeros of the denominator to speak about the possible solutions of the integral. Regards Jens Daohua Song wrote: > > Dear Group, > I am wondering whether the following integration has an analytic > expression. Alough i believe so. > Integrate[x/((a + x)*(b + (c + x^2)^2)),{0,Infinity}]. > When i set a=b=c=1,mathematica give me an answer. > > Any help is appreciated. > sincerely > Daohua