Word Count : 250

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In two dimensions an oblique lattice is defined by two non-orthogonal primitive translation vectors, and its reciprocal lattice is also oblique with primitive reciprocal vectors b₁ and b₂ inclined at an arbitrary angle. The first Brillouin zone is constructed as the Wigner–Seitz cell of this reciprocal lattice around the origin. ________ ___ ______ ________ _______ _________ ______ _______ ______ ________.
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