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- Centre National de la Recherche ScientifiqueFR21 papers
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4 papers · 2 filters
Endpoint for the div-curl lemma in Hardy spaces
Aline Bonami, Justin Feuto, Sandrine Grellier
We give a div-curl type lemma for the wedge product of closed differential forms on R^n when they have coefficients respectively in a Hardy space and L^infinity or BMO. In this las…
Weak type estimates for spherical multipliers on noncompact symmetric spaces
Stefano Meda, Maria Vallarino
In this paper we prove sharp weak type 1 estimates for spherical Fourier multipliers on symmetric spaces of the noncompact type. This complements earlier results of J.-Ph. Anker an…
On the H^1-L^1 boundedness of operators
S. Meda, P. Sjogren, M. Vallarino
We prove that if q is in (1,\infty), Y is a Banach space and T is a linear operator defined on the space of finite linear combinations of (1,q)-atoms in R^n which is uniformly boun…
On the extremal rays of the cone of positive, positive definite functions
Philippe Jaming, Maté Matolcsi, Szilard Gy. Révesz
The aim of this paper is to investigate the cone of non-negative, radial, positive-definite functions in the set of continuous functions on . Elements of this cone admit a Ch…