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An easy vector identity I can't prove

  1. Mar 23, 2012 #1
    Show the following, where U is a vector, and r is the position vector: [itex]\nabla[/itex](U.r) = U in polar coordinates

    Many Thanks
  2. jcsd
  3. Mar 23, 2012 #2
    A quick mechanical check shows it is not right
  4. Mar 23, 2012 #3
    assuming, "find U such that...", i would start with the basis vectors.
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