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Number 1 beside nabla symbol...

  1. Mar 29, 2017 #1
    I have the number 1 next to Nabula and I do not know how to solve it. For reference, I am a Korean person, so it would be very difficult if you explain it difficultly.
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  2. jcsd
  3. Mar 29, 2017 #2

    PeroK

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    You have a function of two vector variables ##\mathbf{r_1} = (x_1, y_1, z_1)## and ##\mathbf{r_2} = (x_2, y_2, z_2)##.

    You can take the gradient with respect to either of these. So ##\nabla_1## is the gradient with respect to the first vector variable and ##\nabla_2## is the gradient with respect to the second vector variable.
     
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