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intersection number

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  • Intersection number — In mathematics, the concept of intersection number arose in algebraic geometry, where two curves intersecting at a point may be considered to meet twice if they are tangent there. In the sense that multiple intersections are limiting cases of n… …   Wikipedia

  • Intersection number (graph theory) — In the mathematical field of graph theory, the intersection number of a graph is the smallest number of elements in a representation of G as an intersection graph of finite sets. Equivalently, it is the smallest number of cliques needed to cover… …   Wikipedia

  • Intersection theory (mathematics) — In mathematics, intersection theory is a branch of algebraic geometry, where subvarieties are intersected on an algebraic variety, and of algebraic topology, where intersections are computed within the cohomology ring. The theory for varieties is …   Wikipedia

  • Intersection algorithm — The Intersection Algorithm is an agreement algorithm used to select sources for estimating accurate time from a number of noisy time sources, it forms part of the modern Network Time Protocol. It is a modified form of Marzullo s algorithm.While… …   Wikipedia

  • Intersection (road) — Crossroad in Kharkov An intersection is a road junction where two or more roads either meet or cross at grade (they are at the same level). An intersection may be 3 way a T junction or fork, 4 way a crossroads, or 5 way or more. It may often be… …   Wikipedia

  • Intersection (set theory) — Intersections of the Greek, Latin and Russian alphabet (upper case graphemes) (The intersection of Greek and Latin letters is used for the Greek licence plates.) …   Wikipedia

  • Intersection graph — In the mathematical area of graph theory, an intersection graph is a graph that represents the pattern of intersections of a family of sets. Any graph may be represented as an intersection graph, but some important special classes of graphs may… …   Wikipedia

  • Intersection for the Arts — infobox Museum name= Eyebeam Art and Technology Center established= 1965 director= Kevin Chen location= 446 Valencia St, San Francisco, California USA website= [http://www.theintersection.org/ www.theintersection.org] Intersection for the Arts,… …   Wikipedia

  • Intersection (aviation) — In aviation, an intersection is a virtual navigational fix that helps aircraft to maintain their flight plan. It is usually defined as the intersection (in the geometrical sense) of two VOR radials.Intersections also play an important role in… …   Wikipedia

  • Intersection of a polyhedron with a line — In general, a convex polyhedron is defined as the intersection of a finite number of halfspaces. That is, a convex polyhedron is the set of solutions of a system of inequations of the form :Ax le b. There are many problems in which it is useful… …   Wikipedia

  • Number theory — A Lehmer sieve an analog computer once used for finding primes and solving simple diophantine equations. Number theory is a branch of pure mathematics devoted primarily to the study of the integers. Number theorists study prime numbers (the… …   Wikipedia

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