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Book
Function Spaces of Logarithmic Smoothness : Embeddings and Characterizations
Authors: ---
ISBN: 1470473496 Year: 2023 Publisher: Providence, RI : American Mathematical Society,

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Abstract

"In this paper we present a comprehensive treatment of function spaces with logarithmic smoothness (Besov, Sobolev, Triebel-Lizorkin). We establish the following results: (1) Sharp embeddings between the Besov spaces defined by differences and by Fourier-analytical decompositions as well as between Besov and Sobolev/Triebel-Lizorkin spaces; (2) Various new characterizations for Besov norms in terms of different Kfunctionals. For instance, we derive characterizations via ball averages, approximation methods, heat kernels, and Bianchini-type norms; (3) Sharp estimates for Besov norms of derivatives and potential operators (Riesz and Bessel potentials) in terms of norms of functions themselves. We also obtain quantitative estimates of regularity properties of the fractional Laplacian. The key tools behind our results are limiting interpolation techniques and new characterizations of Besov and Sobolev norms in terms of the behavior of the Fourier transforms for functions such that their Fourier transforms are of monotone type or lacunary series"--

Maximal functions measuring smoothness
Authors: ---
ISBN: 0821822934 Year: 1984 Publisher: Providence (R.I.): American Mathematical Society

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The averaged moduli of smoothness : applications in numerical methods and approximation
Authors: ---
ISBN: 0471919527 9780471919520 Year: 1988 Volume: vol 85 Publisher: New York Brisbane Singapore


Book
Paley-Wiener theorems for a p-Adic spherical variety
Authors: --- ---
ISBN: 9781470444020 Year: 2021 Publisher: Providence. RI : American Mathematical Society,

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Abstract

"Let SpXq be the Schwartz space of compactly supported smooth functions on the p-adic points of a spherical variety X, and let CpXq be the space of Harish- Chandra Schwartz functions. Under assumptions on the spherical variety, which are satisfied when it is symmetric, we prove Paley-Wiener theorems for the two spaces, characterizing them in terms of their spectral transforms. As a corollary, we get relative analogs of the smooth and tempered Bernstein centers - rings of multipliers for SpXq and C pXq. When X " a reductive group, our theorem for CpXq specializes to the well-known theorem of Harish-Chandra, and our theorem for SpXq corresponds to a first step - enough to recover the structure of the Bernstein center - towards the well-known theorems of Bernstein [Ber] and Heiermann [Hei01]"--


Book
Global smooth solutions for the inviscid SQG equation
Authors: --- ---
ISBN: 1470462478 Year: 2020 Publisher: Providence, Rhode Island : American Mathematical Society,

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Abstract

"In this memoir, we show the existence of the first non trivial family of classical global solutions of the inviscid surface quasi-geostrophic equation"--


Book
Moduli of smoothness
Authors: ---
ISBN: 038796536X 354096536X 1461291518 1461247780 Year: 1987 Volume: 9 Publisher: New York (N.Y.): Springer


Book
Paley-Wiener Theorems for a p-Adic Spherical Variety.
Authors: --- ---
ISBN: 1470464624 Year: 2021 Publisher: Providence : American Mathematical Society,

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Abstract

"Let SpXq be the Schwartz space of compactly supported smooth functions on the p-adic points of a spherical variety X, and let CpXq be the space of Harish- Chandra Schwartz functions. Under assumptions on the spherical variety, which are satisfied when it is symmetric, we prove Paley-Wiener theorems for the two spaces, characterizing them in terms of their spectral transforms. As a corollary, we get relative analogs of the smooth and tempered Bernstein centers - rings of multipliers for SpXq and C pXq. When X " a reductive group, our theorem for CpXq specializes to the well-known theorem of Harish-Chandra, and our theorem for SpXq corresponds to a first step - enough to recover the structure of the Bernstein center - towards the well-known theorems of Bernstein [Ber] and Heiermann [Hei01]"--


Book
Global smooth solutions for the inviscid SQG equation
Authors: --- ---
ISBN: 9781470442149 Year: 2020 Publisher: Providence, RI : American Mathematical Society,

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Abstract

"In this memoir, we show the existence of the first non trivial family of classical global solutions of the inviscid surface quasi-geostrophic equation"--


Book
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