共查询到20条相似文献,搜索用时 15 毫秒
1.
Najib Ouled Azaiez 《Comptes Rendus Mathematique》2006,343(8):511-514
We describe the additive structure of the graded ring of quasimodular forms over any discrete and cocompact group . We show that this ring is not finitely generated. We calculate the exact number of new generators of weight k (even). This number is constant for k sufficiently large and equals , where I and are the ideals of modular forms and quasimodular forms, respectively, over Γ of strictly positive weight. To cite this article: N. Ouled Azaiez, C. R. Acad. Sci. Paris, Ser. I 343 (2006). 相似文献
2.
3.
4.
5.
6.
7.
Fokko Du Cloux 《Inventiones Mathematicae》1987,88(2):375-394
Sans résumé«Unité Associée au C.N.R.S. n° 169» 相似文献
8.
《Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science》2001,332(3):201-204
We give a necessary and sufficient condition for extension of positive-definite functions maximizing a concave functional (entropy). For specific functional (m-weighed extension) this condition is expressed in terms of reflections coefficients and the weight m, moreover the optimal solution is provided. 相似文献
9.
10.
11.
Hajer Bahouri Clotilde Fermanian-Kammerer Isabelle Gallagher 《Comptes Rendus Mathematique》2009,347(17-18):1021-1024
We establish pseudo-differential calculus on the Heisenberg group by defining an algebra of operators acting continuously on Sobolev spaces and containing the class of differential operators. Our approach puts into light microlocal directions and completes, with the Littlewood–Paley theory developed by Bahouri et al., a microlocal analysis of the Heisenberg group. To cite this article: H. Bahouri et al., C. R. Acad. Sci. Paris, Ser. I 347 (2009). 相似文献
12.
Theodor Hangan 《Rendiconti del Circolo Matematico di Palermo》1986,35(2):291-305
One proves that on the three dimensional nilpotent Lie group endowed with a left invariant riemannian metric, the only riemannian flows are the isometric ones. 相似文献
13.
14.
Summary Under the assumption that there exist moments of order four we give a proof of the renewal theorem for random walks on connected compactly generated nilpotent groups. In three dimension, we get a bound for the potential kernel. 相似文献
15.
16.
17.
We give the classification, up to automorphisms, of the left invariant metrics on the Heisenberg group. We determine the Riemannian
curvature tensor, the Killing vector fields for these metrics and the minimal codimension of the totaly geodesic submanifolds.
Travail élaboré à partir d’un séjour du premier auteur à l’Università di Cagliari, dans le cadre d’un contrat de Visiting Professor du C.N.R. d’Italie. 相似文献
Travail élaboré à partir d’un séjour du premier auteur à l’Università di Cagliari, dans le cadre d’un contrat de Visiting Professor du C.N.R. d’Italie. 相似文献
18.
M. Vincent 《Discrete Mathematics》1975,13(1):75-84
L'exposé contient deux résultats principaux. Le premier est une caractérisation de la décomposition canonique d'une fermeture par deux conditions. Le second donne une condition nécessaire et suffisante pour que l'ensemble des fermetures supérieures d'un ensemble ordonné E soit un sous inf-demi treillis complet de l'ensemble des parties de E. 相似文献
19.