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I What's a partial derivative

  1. Sep 7, 2016 #1
    I am a 7th grader who is interested in Quantum mechanics and I'm learning schroninger's equation and there is a partial derivative in it and I looked it up but the best I could find was that it was a function of variables of the variables derivatives, but that didn't make much sense. Can someone please explain to me what a partial derivative is (I know what a derivative is already).
     
  2. jcsd
  3. Sep 7, 2016 #2

    fresh_42

    Staff: Mentor

    A partial derivative is a derivative with respect to only one coordinate while all others are treated as constants.
    E.g. for ##f(x,y,z) = 2x^2 +3yz + xz^2## we get ##\frac{\partial f}{\partial x} = 4x +z^2##.

    Edit: And good luck! You can also look up basic terms on Wikipedia. It is something in between the short answer I gave you and the very long version of what could be said. Perhaps it's worth mentioning, that partial derivatives measure the slope along a coordinate direction, ##x## in the example above. You can always play a little with those functions on Wolfram. If you only use ##x## and ##y## as variables of a function they have nice plots.
     
    Last edited: Sep 7, 2016
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