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Mathematics
Calculus
Difficulties with derivative of a vector [Landau Textbook]
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[QUOTE="etotheipi, post: 6481844"] Not the modulus, it's the second option: the ##\alpha## component of the vector ##\mathbf{n}_a := (\mathbf{r} - \mathbf{r}_a)/|\mathbf{r} - \mathbf{r}_a|##, as L&L define below the bit you posted. So ##n_{a \alpha} := (\mathbf{r} - \mathbf{r}_a)_{\alpha}/|\mathbf{r} - \mathbf{r}_a| = (x_{\alpha} - x_{a \alpha})/|\mathbf{r} - \mathbf{r}_a|## I'll admit it's a slightly confusing notation on the authors' part, using ##a## to enumerate the different sources and ##\alpha## to denote vector components 😜 [/QUOTE]
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Mathematics
Calculus
Difficulties with derivative of a vector [Landau Textbook]
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