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Homework Help: Geodesics of hyperbolic paraboloid ( !)

  1. Apr 12, 2007 #1
    Geodesics of hyperbolic paraboloid (urgent!)

    Help me find the geodesics of the hyperbolic paraboloid z=xy passing through (0,0,0).

    I know that lines and normal sections are geodesics. Based on a picture, I think y=x and y=-x are 2 line geodesics. Then, maybe the planes in the z-y and z-x axis passing through (0,0,0) are geodesics? How can I check this?
  2. jcsd
  3. Apr 12, 2007 #2


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    Homework Helper

    What is your definition of a geodesic?
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