Introduction to Solid State Physics, Lecture 10: Electron Waves in Crystals

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Upper-level undergraduate course taught at the University of Pittsburgh in the Fall 2015 semester by Sergey Frolov.
The course is based on Steven Simon's "Oxford Solid State Basics" textbook.
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At @45 min the derivation goes from a to integral{dr e^[i(k-k')(r+na)]V(r)} Can you explain how you made this step?

SystematicAddict