共查询到20条相似文献,搜索用时 15 毫秒
1.
Nous donnons une caractérisation des domaines DX pour lesquels la fonction extrémale relative *(,E,D) a la propriété de stabilité pour tout ED, i.e. lim
k*(,E,D
k
)=*(,E,D), ED. Ensuite, nous étudions la relation entre cette propriété et les enveloppes pluripolaires. Nous concluons par quelques remarques sur la propriété de stabilité lim
k*(,E
k
,D)=*(,E,D). 相似文献
2.
Armel Fabrice Yode 《Comptes Rendus Mathematique》2005,340(8):623-626
We consider the nonparametric problem of multidimensional probability density estimate. Using concept of minimax risk with random normalizing factor introduced by Lepski [Math. Methods Statist. 8 (1999) 441–486], by considering an independence hypothesis, we build an estimator which can be adaptive and whose accuracy, depending on the observation, is better than the minimax estimate, , with prescribed confidence level. To cite this article: A.F. Yode, C. R. Acad. Sci. Paris, Ser. I 340 (2005). 相似文献
3.
4.
Anatole Khelif 《Comptes Rendus Mathematique》2006,342(6):377-380
In a recent preprint, George M. Bergman has investigated the following property:for any generating set X of the group G there exists an integer n such that any element of G is a product of n elements of . We will say in this case that G has the Bergman property.We have solved some of the questions asked in the above mentioned preprint and have found it suitable to investigate this property in a more general context, in particular for rings (essentially Boolean rings). To cite this article: A. Khelif, C. R. Acad. Sci. Paris, Ser. I 342 (2006). 相似文献
5.
Résumé On étudie la différentiabilité de la fonction croissance d'une variété riemannienne complète. En général, elle a la même régularité qu'une fonction concave: la dérivée peut avoir des sauts pour lesquels on donne une formule. Dans le cas analytique réel, la fonction croissance est de classeC
1. Un exemple montre qu'elle n'est pas nécessairementC
2. A titre d'application, nous construisons, pour toute variété ouverte paracompacteM et toute fonction croissantev de classeC
1, une métrique continue de croissance égale àv et une métrique de classeC
surM de croissance proche dev en topologieC
1-fine.
Travail réalisé avec l'aide financière du MURST d'Italie. 相似文献
6.
7.
Nous estimons la dépendance en la fonction harmonique des fonctionnelles densité de l'intégrale d'aire. Nous obtenons notamment un contrôle en norme de sup
aR
D
u(,a)–D
v(,a) ainsi qu'une inégalité aux bons- de type exponentielle. 相似文献
8.
《Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science》1998,326(6):709-712
We give a short proof of a part of the Bourgain's result from [3]. More precisely, we prove that the Cauchy problem for the Kadomtsev-Petviashvili equation is locally well posed in Sobolev spaces with positive index. 相似文献
9.
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
10.
《Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science》1999,328(4):333-336
Let X be a real-valued Gaussian process with a one-dimensional parameter. If the sample paths of X are of class C2k, k integer and if the marginal distributions of X and its derivatives have no degeneracy, then the distribution function of the maximum on a bounded interval is of class Ck. We give a recurrence method allowing to express the derivatives by means of certain implicit formulae. 相似文献
11.
12.
From the existence of a tower of algebraic function fields, we improve upper bounds on the bilinear complexity of multiplication in all extensions of the finite fields and where p is a prime ?5. In particular, we improve asymptotic upper bounds on this complexity for prime finite fields. To cite this article: S. Ballet, J. Chaumine, C. R. Acad. Sci. Paris, Ser. I 339 (2004). 相似文献
13.
《Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science》1999,328(3):203-208
We complete [3] and we give a purely K-theoretic proof of the Connes-Kasparov conjecture for semi-simple Lie groups. 相似文献
14.
《Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science》1997,324(12):1343-1348
Let V be a complex vector space of dimension n, %plane1D;53E; (resp. %plane1D;53E;*) the Grassmann manifold of p-dimensional (resp. (n — p)-dimensional) subspaces of V, and of Ω the relation of transversality in %plane1D;53E;*%plane1D;53E;*. We announced in [6] equivalences between derived categories of sheaves and of D-modules on %plane1D;53E; and %plane1D;53E; defined by the integral transforms associated to Ω. We show here that these transforms exchange the D-modules associated to the holomorphic line bundles on %plane1D;53E; and %plane1D;53E;*. This is equivalent to “quantizing” the underlying contact transformation between certain open dense subsets of the cotangent bundles. In the case p = 1, we recover already known results for the projective duality (see [1] and [5]). 相似文献
15.
16.
In this Note, we prove a Carleman's estimate for the integro-differential hyperbolic system of the viscoelasticity problem and we use this estimate to obtain a stability result for the inverse problem of recovering a viscoelastic coefficient from a unique internal measure. To cite this article: M. de Buhan, A. Osses, C. R. Acad. Sci. Paris, Ser. I 347 (2009). 相似文献
17.
《Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science》1999,328(2):135-138
We prove that the best constant in the Sobolev inequality (H1p ⊂Lp* with 1/p* = 1/p − 1/n and 1 < p < n) is achieved on compact Riemannian manifolds, or only complete under some hypotheses. We also establish stronger inequalities where the norms are to some exponent which seems optimal. For the proof we show a general result of dominated convergence at a simple point of concentration. 相似文献
18.
《Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science》1997,324(5):569-572
We establish pointwise and uniform large deviations principles for nonparametric kernel density estimators. The estimates are based on sequences of independent and identically distributed real random variables. 相似文献
19.
Mohamed El Kadiri 《Comptes Rendus Mathematique》2005,340(8):563-566
We prove, under some conditions, that a bounded Lebesgue measurable function satisfying the restricted mean value for the biharmonic functions in , , or in an open set of with polar complement, is constant. To cite this article: M. El Kadiri, C. R. Acad. Sci. Paris, Ser. I 340 (2005). 相似文献
20.
《Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science》1997,324(6):725-730
We investigate the approximations of a real x by continued fractions. The reals will be interpreted as periods of certain functions. For a step ɛ > 0, we represent the compressed graph (nɛ. (ƒ(n)))nε N of (n, (ƒ(n)))nε N where ƒ is periodic. The positions of the points of the graph provides us information about the approximations of the period by rationah: we obtain either unions of quasi-curves nothing is known about their functionality, or a strip of points. We give an equivalence between the functionality of these quasi-curves and the membership of the inverse of the period to an ɛ-halo of a convergent of the period. We present our proofs within the framework of Non Standard Analysis. 相似文献