LEFSCHETZ (S.) — LEFSCHETZ SOLOMON (1884 1972) Mathématicien américain d’origine russe, Solomon Lefschetz fut le créateur de la topologie algébrique et a apporté d’importantes contributions à la géométrie algébrique. Né à Moscou, Lefschetz fit ses études à… … Encyclopédie Universelle
Lefschetz — Solomon Lefschetz, (* 3. September 1884 in Moskau; † 5. Oktober 1972 in Princeton, New Jersey, USA) war ein US amerikanischer Mathematiker, der vor allem auf dem Gebiet der Topologie und der Differentialgleichungen arbeitete. Leben und Werk Seine … Deutsch Wikipedia
LEFSCHETZ, SOLOMON — (1884–1972), U.S. mathematician. Born in Moscow, Lefschetz received his doctorate in 1911 at Clarke University. During the years 1907 to 1910 he was employed by the Westinghouse Electric Manufacturing Company at Pittsburgh. He began his academic… … Encyclopedia of Judaism
Lefschetz manifold — In mathematics, a Lefschetz manifold is a particular kind of symplectic manifold.DefinitionsLet M be a (2n) dimensional smooth manifold. Each element: [omega] in H {DR}^2 (M) of the second de Rham cohomology space of M induces a map :L { [omega]… … Wikipedia
Lefschetz fixed-point theorem — In mathematics, the Lefschetz fixed point theorem is a formula that counts the number of fixed points of a continuous mapping from a compact topological space X to itself by means of traces of the induced mappings on the homology groups of X . It … Wikipedia
Lefschetz pencil — In mathematics, a Lefschetz pencil is a construction in algebraic geometry considered by Solomon Lefschetz, in order to analyse the algebraic topology of an algebraic variety V . A pencil here is a particular kind of linear system of divisors on… … Wikipedia
Lefschetz zeta function — In mathematics, the Lefschetz zeta function is a tool used in topological periodic and fixed point theory, and dynamical systems. Given a mapping f , the zeta function is defined as the formal series:zeta f(z) = exp left( sum {n=0}^infty L(f^n)… … Wikipedia
Lefschetz hyperplane theorem — In mathematics, the Lefschetz hyperplane theorem states that a hyperplane section W of a non singular complex algebraic variety V , in complex projective space, inherits most of its algebraic topology from V . This allows certain geometrical… … Wikipedia
Lefschetz duality — In mathematics, Lefschetz duality is a version of Poincaré duality in geometric topology, applying to a manifold with boundary. Such a formulation was introduced by Solomon Lefschetz in the 1920s, at the same time introducing relative homology,… … Wikipedia
Lefschetz, Solomon — (1884–1972) Russian born American mathematician … Bryson’s dictionary for writers and editors
