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Question about operators

  1. Sep 26, 2009 #1
    as an example, say I am operating on r^2 with 2/r*d/dr :

    do I differentiate r^2 first, then times by 2/r or times by 2/r and then differentiate. Confused as they give different answers
  2. jcsd
  3. Sep 26, 2009 #2


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    The operator works precisely as you would expect when you write it out. So
    [tex]\left( \frac{2}{r} \frac{d}{dr} \right)(r^2) = \frac{2}{r} \left( \frac{d}{dr} r^2 \right).[/tex]
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