[Most Popular] Solid State Physics Solutions Manual By Ashcroft Mermin 3
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I have a matrix $$D(\\vec{k})=\\sum_\\vec{R}\\tilde{D}(\\vec{R})\\cos(\\vec{k}\\cdot\\vec{R})$$where $\\vec{R}$ is summed over all atoms positions and $\\tilde{D}$ are 3x3 matrices. $D(k)$ is called the dynamical matrix in solid state physics. 1e1e36bf2d