Show that the equation ψ ( x ) = e i q x u ( x ) follows from ψ ( x − a ) = e − i q a ψ ( x ) , and also show that u ( x ) is a periodic function.

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Chapter 6.2, Problem 6.5P

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Show that the equation ψ(x)=eiqxu(x) follows from ψ(x−a)=e−iqaψ(x), and also show that u(x) is a periodic function.

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