Recent content by Jxs63J

  1. J

    A relatively easy differential geometry question concerning principle curvatures

    Mr Vodka: What you are showing me is what I finally figured out last night. You have basically set this out as a Monge Patch (using the nomenclature of the text) which then allows calculation of the fundamental forms prior to solving for k1 and k2. This requires some plowing through, which...
  2. J

    How can I integrate ln(2x+1) using integration by parts?

    Others above may have said this, but let u = 2x + 1. Then x = (u - 1) / 2. You then get 2 easy integrals.
  3. J

    A relatively easy differential geometry question concerning principle curvatures

    Homework Statement Show the principal curvatures on x sin z - y cos z = 0 are +-1/(1 + x^2 + y^2)