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@ -311,7 +311,7 @@ S_u = [1, s; s, 1];
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\item %2cvii
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\item %2cvii
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Since \(e^{2\pi n} = 1\), we have:
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Since \(e^{2\pi n} = 1\), we have:
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\begin{align*}
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\begin{align*}
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\phi_n(k+\frac{2\pi}{a}) &= Ce^{i(k+\frac{2\pi}{a} \cdot nA} = Ce^{i(k \cdot nA} \\
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\phi_n(k+\frac{2\pi}{a}) &= Ce^{i(k+\frac{2\pi}{a}) \cdot nA} = Ce^{ik \cdot nA} \\
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\phi_n(k+\frac{2\pi}{a}) &= \phi_n(k).
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\phi_n(k+\frac{2\pi}{a}) &= \phi_n(k).
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\end{align*}
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\end{align*}
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Therefore wavefunctions for which \(k\) is separated by \(\frac{2\pi}{a}\) are equivalent, and we
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Therefore wavefunctions for which \(k\) is separated by \(\frac{2\pi}{a}\) are equivalent, and we
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