1) Hyperbolic geometry
Found on
https://www.crosswordclues.com/clue/horosphere
In hyperbolic geometry, a horosphere is a specific hypersurface in hyperbolic n-space. It is the boundary of a horoball, the limit of a sequence of increasing balls sharing (on one side) a tangent hyperplane and its point of tangency. For n = 2 a horosphere is called a horocycle. ==History== The concept has its roots in a notion expressed by F. L....
Found on
http://en.wikipedia.org/wiki/Horosphere
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