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closed sphere

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  • Closed-circuit television — CCTV redirects here. For other uses, see CCTV (disambiguation). For the Chinese television station, see China Central Television. Surveillance cameras on a corner. Closed circuit television (CCTV) is the use of video cameras to transmit a signal… …   Wikipedia

  • Closed surface — In mathematics a closed surface (2 manifold) is a closed manifold of dimension two, with a single connected component. Examples are spaces like the sphere, the torus, and the Klein bottle. They are classified by the genus and their orientability …   Wikipedia

  • Sphere — Globose redirects here. See also Globose nucleus. A sphere (from Greek σφαίρα sphaira , globe, ball, [ [http://www.perseus.tufts.edu/cgi bin/ptext?doc=Perseus%3Atext%3A1999.04.0057%3Aentry%3D%23101561 Sphaira, Henry George Liddell, Robert Scott,… …   Wikipedia

  • Sphere theorem — This article is about sphere theorem for Riemannian manifolds. For a different result by the same name, see Sphere theorem (3 manifolds). In Riemannian geometry, the sphere theorem, also known as the quarter pinched sphere theorem, strongly… …   Wikipedia

  • Closed geodesic — In differential geometry and dynamical systems, a closed geodesic on a Riemannian manifold M is the projection of a closed orbit of the geodesic flow on M. Contents 1 Examples 2 Definition 3 See also 4 …   Wikipedia

  • Unit sphere — some unit spheres In mathematics, a unit sphere is the set of points of distance 1 from a fixed central point, where a generalized concept of distance may be used; a closed unit ball is the set of points of distance less than or equal to 1 from a …   Wikipedia

  • 3-sphere — Stereographic projection of the hypersphere s parallels (red), meridians (blue) and hypermeridians (green). Because this projection is conformal, the curves intersect each other orthogonally (in the yellow points) as in 4D. All curves are circles …   Wikipedia

  • Kline sphere characterization — The Kline Sphere Characterization is a topological characterization of the two dimensional sphere in terms of what sorts of subsets separate it. Its proof was one of the first notable accomplishments of RH Bing.It is well known that a simple… …   Wikipedia

  • N-sphere — can project a sphere s surface to a plane, it can also project a 3 sphere s surface into 3 space. This image shows three coordinate directions projected to 3 space:parallels (red), meridians (blue) and hypermeridians (green).Due to the conformal… …   Wikipedia

  • Riemann sphere — The Riemann sphere can be visualized as the complex number plane wrapped around a sphere (by some form of stereographic projection – details are given below). In mathematics, the Riemann sphere (or extended complex plane), named after the 19th… …   Wikipedia

  • n-sphere — 2 sphere wireframe as an orthogonal projection Just as a …   Wikipedia

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