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MathGroup Archive 2007

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Re: Integration variables

  • To: mathgroup at smc.vnet.net
  • Subject: [mg78367] Re: Integration variables
  • From: dimitris <dimmechan at yahoo.com>
  • Date: Fri, 29 Jun 2007 05:46:41 -0400 (EDT)
  • References: <f5vr6e$j12$1@smc.vnet.net>

Show as your integral please.

Dimitris

            mattew       :
> 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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