Re: Principal Value integral

*To*: mathgroup at smc.vnet.net*Subject*: [mg52411] Re: Principal Value integral*From*: Carlo Teubner <AskMeAndIllTellYou. at example.com>*Date*: Fri, 26 Nov 2004 01:04:44 -0500 (EST)*Organization*: Oxford University, England*References*: <co1fcm$smm$1@smc.vnet.net> <co4e0c$l94$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

That's highly strange. I'm using version 5.0.1 (student version) on Win XP SP2. I just tried it again on a fresh kernel, gives the same wrong result. Must be a bug peculiar to 5.0.1 then I guess... can anyone else confirm this? Carlo >>The following Principal Value integral does not appear to give the >>correct result. >> >>Integrate[1/(x^3-1), {x, -Infinity, Infinity}, PrincipalValue->True] >> >>This gives I Pi / 3, which surely can't be right since the answer should >>be real. > > > Using version 5.0, the result is correct: -Pi/Sqrt[3] . > What version are you using?