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Kissing number

Unsolved problem in mathematicsWhat is the maximum possible kissing number for n-dimensional spheres in (n + 1)-dimensional Euclidean space?More unsolved problems in mathematicsIn geometry, the kissing number of a mathematical space is defined as the greatest number of non-overlapping unit spheres (i.e., of radius 1) that can be arranged in that space such that they each touch a common unit sphere.

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