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- Centre National de la Recherche ScientifiqueFR13 papers
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7 papers · 1 filter
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…
Distances sets that are a shift of the integers and Fourier basis for planar convex sets
Alex Iosevich, Philippe Jaming
The aim of this paper is to prove that if a planar set has a difference set satisfying for suitable than has at most 3 elements. This result…
Nazarov's uncertainty principles in higher dimension
Philippe Jaming
In this paper we prove that there exists a constant such that, if are subsets of of finite measure, then for every function , $$\int_{\R^d}|f(x)|^2…