Results 21 to 30 of about 348 (122)
Pointwise multipliers on weighted BMO spaces [PDF]
Studia Mathematica, 1997 Summary: Let \(E\) and \(F\) be spaces of real- or complex-valued functions defined on a set \(X\). A real- or complex-valued function \(g\) defined on \(X\) is called a pointwise multiplier from \(E\) to \(F\) if the pointwise product \(fg\) belongs to \(F\) for each \(f\in E\).
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Pointwise multipliers for Triebel–Lizorkin and Besov spaces on Lie groups
Bulletin des Sciences Mathématiques, 2023 30 ...
Tommaso Bruno +2 more
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Multiplier Operators and Invariant Subspace Structures in Complex-Valued Harmonic Function Spaces
Journal of MathematicsIn this paper, we characterize subspaces of complex-valued harmonic functions in the unit disk in terms of prescribed dilatations, study their pointwise multiplier algebras, and investigate multipliers and invariant subspaces on the harmonic Hardy space.
Ayantu Guteta Fite +1 more
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On pointwise convergence of cone multipliers
Journal of Functional AnalysisFor $p\ge 2$, and $λ>\max\{n|\tfrac 1p-\tfrac 12|-\tfrac12, 0\}$, we prove the pointwise convergence of cone multipliers, i.e. $$ \lim_{t\to\infty}T_t^λ(f)\to f \text{ a.e.},$$ where $f\in L^p(\mathbb R^n)$ satisfies $supp\ \widehat f\subset\{ξ\in\mathbb R^n:\ 1<|ξ_n|<2\}$.
Peng Chen +3 more
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Pointwise multipliers of weighted BMO spaces [PDF]
Proceedings of the American Mathematical Society, 1989 Let \(w:{\mathbb{R}}\to {\mathbb{R}}^+\) be a weight function satisfying the doubling condition: \(\int_{J}w(x)dx\leq C\int_{I}w(x)dx\), whenever I and J are intervals such that \(I\subset J\) and \(| J| \leq 2| I|\). The paper under review describes the weighted atomic \(H^ 1\)- space \(H_ w^ 1({\mathbb{R}})\) and weighted BMO-space \(BMO_ w({\mathbb ...
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On a problem of Jaak Peetre concerning pointwise multipliers of Besov spaces [PDF]
Studia Mathematica, 2018 23 ...
Nguyen, Van Kien, Sickel, Winfried
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Pointwise multipliers between weighted copson and cesàro function spaces
Mathematica Slovaca, 2019 Abstract In this paper the solution of the pointwise multiplier problem between weighted Copson function spaces Copp1,q1(u1, v1) and weighted Cesàro function spaces Cesp2,q2(u2, v2) is presented, where p1, p2, q1, q2 ∈ (0, ∞), p2 ≤ q2 and u1, u2, v1, v2 are weights on (0, ∞).
Gogatishvili, Amiran +2 more
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Pointwise multipliers on the weighted BMOA space
Journal of Physics: Conference Series, 2020 Abstract Let D = {z : |z| < 1} be the unit disk in the complex plane C, Φ :
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Pointwise Multipliers on BMO Spaces with Non-doubling Measures
Taiwanese Journal of Mathematics, 2018 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Li, Wei, Nakai, Eiichi, Yang, Dongyong
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Pointwise multipliers for functions of bounded mean oscillation
Journal of the Mathematical Society of Japan, 1985 We characterize the set of pointwise multipliers on bmo\({}_{\phi}({\mathbb{R}}^ n)\), which generalizes the corresponding theorem by \textit{S. Janson} in the torus case [Ark. Mat. 14, 189-196 (1976; Zbl 0341.43005)]. To be more precise, let \(\phi\) (r) be a nondecreasing concave function on the positive real line, and \[ w(x,r)=\phi (r)/(|\int^{1}_ ...
NAKAI, Eiichi, YABUTA, Kozo
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