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math.CA2020
Variation bounds for spherical averages
David Beltran, Richard Oberlin, Luz Roncal +2
We consider -variation operators for the family of spherical means, with special emphasis on estimates.
math.CA2020★ 12 cited
Multi-scale sparse domination
David Beltran, Joris Roos, Andreas Seeger
We prove a bilinear form sparse domination theorem that applies to many multi-scale operators beyond Calderón-Zygmund theory, and also establish necessary conditions. Among the app…