共查询到20条相似文献,搜索用时 46 毫秒
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Michel Balazard 《Archiv der Mathematik》2008,90(1):31-38
We give an identity for the summatory function of the generalized von Mangoldt function
Received: 19 February 2007 相似文献
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《Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science》1999,328(10):887-890
We consider a topological space which is locally isomorphic to the quotient of Rk by the action of a discrete group and we call it quasifold of dimension k. Quasifolds generalize manifolds and orbifolds and represent the natural framework for performing symplectic reduction with respect to the induced action of any Lie subgroup, compact or not, of a torus. We define quasitori, Hamiltonian actions of quasitori and the moment mapping for symplectic quasifolds, and we show that every simple convex polytope, rational or not, is the image of the moment mapping for the action of a quasitorus on a quasifold. 相似文献
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Jacques Deny 《Archiv der Mathematik》1954,5(4-6):367-370
Sans résuméEn hommage au professeurOstrowski 相似文献
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《Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science》1998,326(3):335-338
On the unit ball of, one considers the standard hyperbolic metric H0 whose Ricci curvature equals R0 and Riemann-Christoffel curvature is. We prove that, for any symmetric tensor R near R0, there exists a unique metric H near H0 whose Ricci curvature is R. We deduce in the C∞ case that the image of the Riemann-Christoffel operator is a submanifold in a neighborhood of. Finally, we study more precisely the Ricci equation in dimension 2. 相似文献
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Jean-Yves Hée 《Journal of Algebra》2009,321(3):1039-1048
The theorem of linearity of the Artin–Tits groups of spherical type and the theorem of injectivity of any Artin–Tits monoid in its group are essentially based on the faithfulness of the Lawrence–Krammer–Paris representation restricted to the monoid. We prove this faithfulness using neither the normal forms of the elements of the monoid nor the closed subsets of the associated root system; only very elementary notions are needed. 相似文献
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Michel Méo 《Comptes Rendus Mathematique》2010,348(11-12):625-628
The obstructions, for a closed differential form on a projective manifold, to be cohomologous to an algebraic cycle with complex coefficients, are computed in terms of the Chow transformation. They can be expressed as an orthogonality condition, on the manifold itself, with families parametrized by the Grassmannian of currents which are completely determined. A parameter does not yield any obstruction if the associated projective subspace meets properly the manifold. The embedding of the manifold is degenerated, in view of applying the characterization of currents associated to algebraic cycles by the Chow transformation. We study the set of periods obtained when the parameter varies, in particular, we prove a continuity result, thanks to the constructibility of the Bernstein polynomial. When the cohomology class is rational, we conjecture that this set is connected. 相似文献
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Lars Gårding 《Acta Mathematica》1965,114(1):143-158
Sans résumé
Conférence faite au Congrès des mathématiciens scandinaves à Copenhague en ao?t 1964. 10-652932 相似文献
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B. Maisonneuve 《Probability Theory and Related Fields》1983,63(4):501-510
Résumé La théorie des ensembles régénératifs stationnaires de la droite a été étudiée récemment par Taksar (Regerative sets on real line — Séminaire de probabilités XIV, Lecture Notes in Mathematics 784, Springer 1980). Dans le présent article, nous développons une théorie des ensembles régénératifs de la droite (non nécessairement stationnaires) à partir d'une définition extrêmement maniable, nouvelle même pour les ensembles régénératifs de +, et nous retrouvons de manière simple les résultats de Taksar concernant le cas stationnaire. 相似文献
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H. Ramírez-León C. Couder-Castañeda I.E. Herrera-Díaz H.A. Barrios-Piña 《Revista Internacional de Métodos Numéricos para Cálculo y Dise?o en Ingeniería》2013,29(2):114-121
This work contributes to the study of nuclear plant thermal discharges in coastal areas by using a numerical model which solves the Navier-Stokes-Reynolds equations for shallow waters and the energy equation for computing temperature variations. The numerical model takes into account the heat flux given in the upper layer, where the free surface and the atmosphere interact. In this study, the thermal plume dispersion from the nuclear power plant Laguna Verde, Veracruz, Mexico, is analyzed. Bathymetry, oceanographic, meteorological, hydrologic and plant operating data are used to run numerical simulations. The results are compared against observed data showing good agreement. The Nash-Suffle's criterion is also applied to verify the quality of the numerical solution obtaining suitable results. 相似文献