English

The disk model of the hyperbolic plane, with a horosphere in blue.

Noun

horosphere ‎(plural horospheres)

1. 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.

See also

• horosphere on Wikipedia.Wikipedia

Anagrams

• rheophores