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math.FA2021★ 3 cited
Hilbert points in Hardy spaces
Ole Fredrik Brevig, Joaquim Ortega-Cerdà, Kristian Seip
A Hilbert point in , for and , is a nontrivial function in such that $\| φ\|_{H^p(\mathbb{T}^d)} \leq \|φ+…
math.FA2021★ 3 cited
Idempotent Fourier multipliers acting contractively on spaces
Ole Fredrik Brevig, Joaquim Ortega-Cerdà, Kristian Seip
We describe the idempotent Fourier multipliers that act contractively on spaces of the -dimensional torus for and . When …