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ehrenfest
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Homework Statement
This question refers to Kittel's solid-state physics book.
On this page, in the section about the "Kronig-Penney Model in Reciprocal Space", I do not understand why the sum over s is from 0 to 1/a. What if a is 2?
Also, how do they know that "the boundary conditions are periodic over a ring of unit length"?
Homework Equations
The Attempt at a Solution
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