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:<math>E_n(\bold{k}) = \frac{\hbar^2 (\bold{k} + \bold{G_n})^2}{2m}</math>
The <math>\bold{G}_n</math> are the [[reciprocal lattice]] vectors to which the bands{{clarification}} <math>E_n(\bold{k})</math> belong.
The figure on the right shows the dispersion relation for three periods in reciprocal space of a one-dimensional lattice with lattice cells of length ''a''.
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