**Horoball** — In mathematics, particularly hyperbolic geometry, a horoball is a specific kind of n dimensional object in hyperbolic n space. Consider the upper half space model of hyperbolic space. Then a horosphere is given by a horizontal plane, and the… … Wikipedia

**2π theorem** — In mathematics, the 2π theorem of Gromov and Thurston states a sufficient condition for Dehn filling on a cusped hyperbolic 3 manifold to result in a negatively curved 3 manifold. Let M be a cusped hyperbolic 3 manifold. Disjoint horoball… … Wikipedia

**Knot theory** — A three dimensional depiction of a thickened trefoil knot, the simplest non trivial knot … Wikipedia

**Colin Adams (mathematician)** — This article is about the mathematician. For the TV executive, see Colin Adams (executive). Colin Adams. Colin Conrad Adams (born October 13, 1956) is a mathematician primarily working in the areas of hyperbolic 3 manifolds and knot theory. His… … Wikipedia

**List of mathematics articles (H)** — NOTOC H H cobordism H derivative H index H infinity methods in control theory H relation H space H theorem H tree Haag s theorem Haagerup property Haaland equation Haar measure Haar wavelet Haboush s theorem Hackenbush Hadamard code Hadamard… … Wikipedia