Displaying 701 – 720 of 2299

Showing per page

Fonctions définies dans le plan et vérifiant certaines propriétés de moyenne

Alain Yger (1981)

Annales de l'institut Fourier

Soit a un réel de ] 0 , 1 [ . Nous étudions le système d’équations de convolution suivant ( * ) x R 2 , f ( x ) = 1 4 ϵ = ± 1 ϵ ' = ± 1 f ( x + ( ϵ , ϵ ' ) ) = 1 4 ϵ = ± 1 ϵ ' = ± 1 f ( x + a ( ϵ , ϵ ' ) ) . Nous démontrons que les exponentielles polynômes solutions de ( * ) sont denses dans l’espace des solutions C du système d’équations; l’idéal de ' ( R 2 ) engendré par les transformées de Fourier des deux mesures intervenant ici est “slowly decreasing” au sens de Berenstein-Taylor. Lorsque a n’est pas un nombre de Liouville, nous montrons qu’il existe un ouvert relativement compact telle que toute solution distribution de ( * ) régulière...

Formule de Gutzmer pour la complexification d'une espace Riemannien symétrique

Jacques Faraut (2002)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

A Gutzmer formula for the complexification of a Riemann symmetric space. We consider a complex manifold Ω and a real Lie group G of holomorphic automorphisms of Ω . The question we study is, for a holomorphic function f on Ω , to evaluate the integral of f 2 over a G -orbit by using the harmonic analysis of G . When Ω is an annulus in the complex plane and G the rotation group, it is solved by a classical formula which is sometimes called Gutzmer’s formula. We establish a generalization of it when Ω is...

Fourier analysis, Schur multipliers on S p and non-commutative Λ(p)-sets

Asma Harcharras (1999)

Studia Mathematica

This work deals with various questions concerning Fourier multipliers on L p , Schur multipliers on the Schatten class S p as well as their completely bounded versions when L p and S p are viewed as operator spaces. For this purpose we use subsets of ℤ enjoying the non-commutative Λ(p)-property which is a new analytic property much stronger than the classical Λ(p)-property. We start by studying the notion of non-commutative Λ(p)-sets in the general case of an arbitrary discrete group before turning to the...

Currently displaying 701 – 720 of 2299