- #1
LagrangeEuler
- 717
- 20
Homework Statement
Calculate [tex]\nabla e^{i\vec{k}\cdot \vec{r}}[/tex]
Homework Equations
[tex]\nabla f(r)=\frac{df}{dr}\nabla r=\frac{df}{dr}\frac{\vec{r}}{r} [/tex]
The Attempt at a Solution
I have a problem. I know result
[tex]=\nabla e^{i\vec{k}\cdot \vec{r}}=i\vec{k} e^{i\vec{k}\cdot \vec{r}}[/tex]
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