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I Subscript derivative notation

  1. Apr 25, 2016 #1
    I have an equation that looks like

    At, r = Aφ, r

    If I know that Aφ = r4 , then how do I find At ?

    I believe that the above equation is equivalent to: ∂/∂r (At) = ∂/∂r (Aφ) , correct?

    Then substitute the value Aφ and we have ∂/∂r (At) = ∂/∂r (r4)

    And then to get At I take the integral on both sides? so eventually At = r5/5 ?
  2. jcsd
  3. Apr 25, 2016 #2


    Staff: Mentor

    Yes, ##A_{t, r}## is notation that means ##\frac{\partial}{\partial r}\frac{\partial A}{\partial t}##
    Yes. Integrate with respect to r.
    Are r and t independent of each other. If so, the above looks fine.
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