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"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"--
Function spaces. --- Logarithms. --- Smoothness of functions.
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Functions of several real variables --- Maximal functions --- Smoothness of functions --- Sobolev spaces
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"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]"--
Spherical harmonics. --- p-adic analysis. --- Fourier analysis. --- Harmoniques sphériques --- Analyse p-adique --- Fourier, Analyse de --- Schwartz spaces. --- Scattering (Mathematics) --- Smoothness of functions. --- Lie algebras.
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"In this memoir, we show the existence of the first non trivial family of classical global solutions of the inviscid surface quasi-geostrophic equation"--
Fluid dynamics --- Inviscid flow. --- Flows (Differentiable dynamical systems) --- Fluid mechanics. --- Smoothness of functions. --- Geostrophic currents --- Interval analysis (Mathematics) --- Differential equations, Nonlinear --- Mathematical models. --- Mathematical models. --- Numerical solutions.
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Moduli theory --- Smoothness of functions --- Variétés topologiques à 4 dimensions --- Modules, théorie des --- 517.5 --- Smooth functions --- Functions --- Theory of moduli --- Analytic spaces --- Functions of several complex variables --- Geometry, Algebraic --- Theory of functions --- Moduli theory. --- Smoothness of functions. --- 517.5 Theory of functions --- Variétés topologiques à 4 dimensions --- Modules, théorie des --- Fonctions d'une variable reelle --- Approximation
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"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]"--
Spherical harmonics. --- p-adic analysis. --- Fourier analysis. --- Schwartz spaces. --- Scattering (Mathematics) --- Smoothness of functions. --- Lie algebras. --- Topological groups, Lie groups -- Lie groups -- Analysis on $p$-adic Lie groups. --- Abstract harmonic analysis -- Abstract harmonic analysis -- Analysis homogeneous spaces.
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"In this memoir, we show the existence of the first non trivial family of classical global solutions of the inviscid surface quasi-geostrophic equation"--
Computer-assisted instruction --- Enseignement assisté par ordinateur --- Équations aux dérivées partielles --- Differential equations --- Linear operators --- Opérateurs linéaires --- Théorie asymptotique. --- Asymptotic theory. --- Fluid mechanics. --- Fluid dynamics --- Interval analysis (Mathematics) --- Inviscid flow. --- Flows (Differentiable dynamical systems) --- Differential equations, Nonlinear --- Smoothness of functions. --- Geostrophic currents --- Mathematical models. --- Numerical solutions.
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Smoothness of functions. --- Smooth functions --- Functions --- Funcions --- Càlcul diferencial --- Càlcul --- Càlcul integral --- Funcions (Matemàtica) --- Funcions matemàtiques --- Anàlisi matemàtica --- Teoria de conjunts --- Aplicacions (Matemàtica) --- Constants matemàtiques --- Convergència (Matemàtica) --- Convolucions (Matemàtica) --- Funcions algebraiques --- Funcions contínues --- Funcions discontínues --- Funcions d'ona --- Funcions especials --- Teoria de l'aproximació --- Superfícies de Riemann
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Mathematical analysis --- 517.54 --- 51 <082.1> --- Conformal mapping and geometric problems in the theory of functions of a complex variable. Analytic functions and their generalizations --- Mathematics--Series --- 517.54 Conformal mapping and geometric problems in the theory of functions of a complex variable. Analytic functions and their generalizations --- Harmonic functions. --- Green's functions. --- Inequalities (Mathematics) --- Smoothness of functions. --- Fonctions harmoniques. --- Green, Fonctions de. --- Inégalités (mathématiques) --- Fonctions de lissage. --- Green's functions --- Harmonic functions --- Smoothness of functions --- Smooth functions --- Functions --- Processes, Infinite --- Functions, Harmonic --- Laplace's equations --- Bessel functions --- Differential equations, Partial --- Fourier series --- Harmonic analysis --- Lamé's functions --- Spherical harmonics --- Toroidal harmonics --- Functions, Green's --- Functions, Induction --- Functions, Source --- Green functions --- Induction functions --- Source functions --- Differential equations --- Potential theory (Mathematics)
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