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5 papers · 1 filter
Spaces H^1 and BMO on ax+b-groups
Maria Vallarino
Let S be the semidirect product of R^d and R^+ endowed with the Riemannian symmetric space metric and the right Haar measure: this is a Lie group of exponential growth. In this pap…
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…
A bisection algorithm for the numerical Mountain Pass
Vivina Barutello, Susanna Terracini
We propose a constructive proof for the Ambrosetti-Rabinowitz Mountain Pass Theorem providing an algorithm, based on a bisection method, for its implementation. The efficiency of o…
estimates for overdetermined Radon transforms
Luca Brandolini, Allan Greenleaf, Giancarlo Travaglini
We prove several variations on the results of Ricci and Travaglini concerning bounds for convolution with all rotations of a measure supported by a fixed convex curve in the plane.…