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Kissing number
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===One dimension=== In one dimension,<ref>Note that in one dimension, "spheres" are just pairs of points separated by the unit distance. (The vertical dimension of one-dimensional illustration is merely evocative.) Unlike in higher dimensions, it is necessary to specify that the interior of the spheres (the unit-length open intervals) do not overlap in order for there to be a finite packing density.</ref> the kissing number is 2: [[File:Kissing-1d.svg|center]]
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