- #1
kanonear
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In "Electrons and Phonons" by Ziman which you can find here, I have a problem with equation (9.5.14) on page 360 and (9.5.17) on page 361. I don't understand how from the first equation where you have double surface integral you obtain the second equation with only one integral over q.
I don't think it's a mathematical transformation, but something with physical assumptions.
Can anybody help me with that?
I don't think it's a mathematical transformation, but something with physical assumptions.
Can anybody help me with that?