A point lattice which can be constructed from an arbitrary parallelogram of unit area. For any such planar lattice, the minimum distance c between any two points is a quantity characteristic of the lattice. This distance satisfies c<=sqrt(2/sqrt(3)) (Hilbert and Cohn-Vossen 1999, p. 36). For a lattice in three dimensions, c<=2^(1/6) (Hilbert and Cohn-Vossen 1999, p. 45).
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