[Pw_forum] Questions about the DFPT review paper

[Caloma Trumica]

Can someone help answer my questions. Thank you so much!

On Wed, Oct 24, 2012 at 7:38 PM, Caloma Trumica <spmmal at gmail.com> wrote:

> Dear all,
>
> I do not understand why the two highlighted places in the attached DFPT
> review paper are correct.
>
> I repeat my questions here:
>
> 1. Why the contributions from valence bands cancel each other?
>
> 2. Why the left side of Eq.25 has a null eigenvalue?
>
> Thank you!
>
> Andy
>
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