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What the hell is Green's third identity talking about?

  1. May 3, 2005 #1

    quasar987

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    Here it is on Mathworld:

    http://mathworld.wolfram.com/GreensIdentities.html

    On Wikipedia, it's a total carnage:

    http://en.wikipedia.org/wiki/Green's_identities

    In Mathworld, what are r, n and ds in cartesian coordinate?
     
  2. jcsd
  3. May 4, 2005 #2

    arildno

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    r is the positive distance from the singularity, ds is the line element, and [tex]\frac{\partial{u}}{\partial{n}}\equiv\nabla{u}\cdot\vec{n}[/tex], i.e, the component of the gradient of u along the normal to the curve.
     
  4. May 4, 2005 #3

    dextercioby

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