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Definition of Horosphere
1. Noun. An -dimensional hyperplane in hyperbolic -dimensional space: it is (in the Poincaré disk) Euclidean-tangent at infinity to the boundary sphere or (in the upper-half-space model) Euclidean-parallel to the boundary hyperplane. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Horosphere
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