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one-sheeted hyperboloid

Hyperboloid — Not to be confused with Hyperbolic paraboloid. Hyperboloid of one sheet … Wikipedia
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
Multilateration — is a navigation technique based on the measurement of the difference in distance to two or more stations at known locations that broadcast signals at known times. Unlike measurements of absolute distance or angle, measuring the difference in… … Wikipedia
Differential geometry of surfaces — Carl Friedrich Gauss in 1828 In mathematics, the differential geometry of surfaces deals with smooth surfaces with various additional structures, most often, a Riemannian metric. Surfaces have been extensively studied from various perspectives:… … Wikipedia
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