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In geometry, a set of lines is called equiangular if all the lines intersect at a single point, and every pair of lines makes the same angle.

Equiangular lines in Euclidean space

Computing the maximum number of equiangular lines in n-dimensional Euclidean space is a difficult problem, and unsolved in general, though bounds are known. The maximal number of equiangular lines in 2-dimensional Euclidean

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