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MathGroup Archive 2007

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Re: Integration variables

  • To: mathgroup at
  • Subject: [mg78348] Re: Integration variables
  • From: Jens-Peer Kuska <kuska at>
  • Date: Thu, 28 Jun 2007 06:35:34 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <f5vr6e$j12$>
  • Reply-to: kuska at


you have to write out

d Cos[th]


-Sin[th] d th


mattew wrote:
> Hi everybody, Mathematica gives us the possibility to use spherical coordinates (r,Ttheta,Pphi): I'm trying to write an integral in the polar angle Ttheta of the form:
> Integral in [-1,1] Ttheta dCos(Ttheta)
> where Ttheta is the polar angle and the integration variable is the cosine of Ttheta in the interval [-1,1].
> I got the following error:
> ntegrate::ivar: "Cos[Ttheta] is not a valid variable."
> Does anyone knows the reason for that?
> p.s: It happens with any system of coordinates, actually.

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