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group of projectivities

См. также в других словарях:

  • Inversive ring geometry — In mathematics, inversive ring geometry is the extension to the context of associative rings, of the concepts of projective line, homogeneous coordinates, projective transformations, and cross ratio, concepts usually built upon rings that happen… …   Wikipedia

  • Split-quaternion — Coquaternion multiplication × 1 i j k 1 1 i j k i i −1 k −j j j −k +1 −i …   Wikipedia

  • Projective transformation — A projective transformation is a transformation used in projective geometry: it is the composition of a pair of perspective projections. It describes what happens to the perceived positions of observed objects when the point of view of the… …   Wikipedia

  • Category of rings — In mathematics, the category of rings, denoted by Ring, is the category whose objects are rings (with identity) and whose morphisms are ring homomorphisms (preserving the identity). Like many categories in mathematics, the category of rings is… …   Wikipedia

  • Corrado Segre — Born 20 August 1863(1863 08 20) Saluzzo, Italy …   Wikipedia

  • Luis Santaló — Luís Antoni Santaló Sors (born October 09 1911 in Girona, Spain died November 22, 2001 in Buenos Aires, Argentina) was an important Argentine Spanish mathematician.He graduated from the University of Madrid and he studied in the University of… …   Wikipedia

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