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doubly convex

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  • Convex bipartite graph — In the mathematical field of graph theory, a convex bipartite graph is a bipartite graph with specific properties. A bipartite graph, (U ∪ V, E), is said to be convex over the vertex set U if U can be enumerated such that for all… …   Wikipedia

  • Doubly stochastic matrix — In mathematics, especially in probability and combinatorics, a doubly stochastic matrix (also called bistochastic), is a square matrix of nonnegative real numbers, each of whose rows and columns sums to 1. Thus, a doubly stochastic matrix is both …   Wikipedia

  • Doubly connected edge list — The doubly connected edge list (DCEL) is a data structure to represent an embedding of a planar graph in the plane and polytopes in 3D. This data structure provides efficient manipulation of the topological information associated with the objects …   Wikipedia

  • Doubly-connected edge list — The doubly connected edge list (DCEL) is a data structure to represent an embedding of a planar graph in the plane and polytopes in 3D. This data structure provide efficient manipulation of the topological information associated with the objects… …   Wikipedia

  • Schmidt-Väisälä camera — The Schmidt Väisälä camera is an astronomical telescopeIntended for wide field (5 to 10 degrees of arc) photographic work. It was designed by Yrjö Väisälä.Invention and designProf. Yrjö Väisälä originally designed an astronomical camera similar… …   Wikipedia

  • Schmidt camera — A Schmidt camera, also referred to as the Schmidt telescope, is an astronomical camera designed to provide wide fields of view with limited aberrations. Other similar designs are the Wright Camera and Lurie Houghton telescope.Invention and… …   Wikipedia

  • Longsword — For other uses, see Longsword (disambiguation). Longsword Swiss longsword, ca. 1500 (Morges museum) Type Sword …   Wikipedia

  • Yrjö Väisälä — Infobox Scientist name = Yrjö Väisälä birth date = September 6, 1891 birth place = death date = July 21, 1971 death place = residence = citizenship = nationality = Finnish ethnicity = field = physics work institutions = alma mater = doctoral… …   Wikipedia

  • crystalline lens — Anat. a doubly convex, transparent body in the eye, situated behind the iris, that focuses incident light on the retina. See diag. under eye. [1785 95] * * * …   Universalium

  • lentil — /len til, tl/, n. 1. a plant, Lens culinaris, of the legume family, having flattened, biconvex seeds used as food. 2. the seed itself. [1200 50; ME < OF lentille < VL *lenticula for L lenticula. See LENTICLE] * * * Small annual legume (Lens… …   Universalium

  • lens — [[t]lɛnz[/t]] n. pl. lens•es 1) opt a piece of transparent substance, usu. glass, having two opposite surfaces either both curved or one curved and one plane, used in optical devices for changing the convergence of light rays, as for… …   From formal English to slang

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