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Partial equation problem

  1. Aug 21, 2010 #1
    Can you give me idea how to solve equation?

    [tex]\Delta f=cos(\vec{k}\cdot\vec{r})[/tex]

    where [tex]\Delta[/tex] is Laplacian and [tex]\vec{k}=\vec{const}[/tex]
     
  2. jcsd
  3. Aug 22, 2010 #2
    What is r ?
     
  4. Aug 22, 2010 #3
    Radius vector!

    [tex]\vec{r}=x\vec{e}_x+y\vec{e}_y+z\vec{e}_z[/tex]
     
  5. Aug 22, 2010 #4
    An obvious particular solution allows to express the general solution (attachment)
     

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