hyperboloid of two sheets

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• Hyperboloid — Not to be confused with Hyperbolic paraboloid. Hyperboloid of one sheet …   Wikipedia

• hyperboloid — hyperboloidal, adj. /huy perr beuh loyd /, n. Math. a quadric surface having a finite center and some of its plane sections hyperbolas. Equation: x2/a2 + y2/b2 z2/c2 = 1. [1720 30; HYPERBOL(A) + OID] * * * ▪ mathematics       the open surface… …   Universalium

• Hyperboloid — Hy*per bo*loid, n. [Hyperbola + oid: cf. F. hyperbolo[ i]de.] (Geom.) A surface of the second order, which is cut by certain planes in hyperbolas; also, the solid, bounded in part by such a surface. [1913 Webster] {Hyperboloid of revolution}, an… …   The Collaborative International Dictionary of English

• Hyperboloid of revolution — Hyperboloid Hy*per bo*loid, n. [Hyperbola + oid: cf. F. hyperbolo[ i]de.] (Geom.) A surface of the second order, which is cut by certain planes in hyperbolas; also, the solid, bounded in part by such a surface. [1913 Webster] {Hyperboloid of… …   The Collaborative International Dictionary of English

• Hyperboloid model — In geometry, the hyperboloid model, also known as the Minkowski model or the Lorentz model (after Hermann Minkowski and Hendrik Lorentz), is a model of n dimensional hyperbolic geometry in which points are represented by the points on the forward …   Wikipedia

• algebraic surface —       in three dimensional space, a surface the equation of which is f(x, y, z) = 0, with f(x, y, z) a polynomial in x, y, z. The order of the surface is the degree of the polynomial equation. If the surface is of the first order, it is a plane.… …   Universalium

• de Sitter space — In mathematics and physics, a de Sitter space is the analog in Minkowski space, or spacetime, of a sphere in ordinary, Euclidean space. The n dimensional de Sitter space , denoted dSn, is the Lorentzian manifold analog of an n sphere (with its… …   Wikipedia

• sheet — sheet1 sheetless, adj. sheetlike, adj. /sheet/, n. 1. a large rectangular piece of cotton, linen, or other material used as an article of bedding, commonly spread in pairs so that one is immediately above and the other immediately below the… …   Universalium

• sheet — I. noun Etymology: Middle English shete, from Old English scēte, scīete; akin to Old English scēat edge, Old High German scōz flap, skirt Date: before 12th century 1. a. a broad piece of cloth; especially bedsheet b. sail 1a(1) 2 …   New Collegiate Dictionary

• Quadric — In mathematics, a quadric, or quadric surface, is any D dimensional hypersurface defined as the locus of zeros of a quadratic polynomial. In coordinates {x 0, x 1, x 2, ldots, x D}, the general quadric is defined by the algebraic equation… …   Wikipedia

• De Sitter space — In mathematics and physics, n dimensional De Sitter space, denoted dS n, is the Lorentzian analog of an n sphere (with its canonical Riemannian metric). It is a maximally symmetric, Lorentzian manifold with constant positive curvature, and is… …   Wikipedia