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Math Help - integration from plus to minus infinity

  1. #1
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    integration from plus to minus infinity

    it an integral of \frac{2\pi k' r^3\pho \omega rdr dz}{(z^2+r^2)^\frac{3}{2}}
    its a double integral but
    how to integrate by dz
    from plus to minus infinity
    ?
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Re: integration from plus to minus infinity

    Quote Originally Posted by transgalactic View Post
    it an integral of \frac{2\pi k' r^3\pho \omega rdr dz}{(z^2+r^2)^\frac{3}{2}}
    its a double integral but
    how to integrate by dz
    from plus to minus infinity
    ?
    We can't help you because the problem is missing an important piece of information (the limits for r). Please post the whole problem.
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  3. #3
    MHF Contributor Siron's Avatar
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    Re: integration from plus to minus infinity

    modified.
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  4. #4
    Super Member Aryth's Avatar
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    Re: integration from plus to minus infinity

    Quote Originally Posted by Chris L T521 View Post
    We can't help you because the problem is missing an important piece of information (the limits for r). Please post the whole problem.
    Could you switch the order of integration on this? If 2\pi k' \omega are constant wrt z and r I don't see the difference in integrating wrt z first or wrt r first. If that is the case you could just integrate wrt z and then let the OP use the limits they have wrt r. (I guess either way there would need to be an extra piece of information, whether the above vars are constant wrt r and z or the limits on r).
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