Commutators and Sobolev spaces
Sadek Gala
这篇论文被arXiv管理员撤回，因为它抄袭了“Chen，Wen Gu（PRC-BIAP）; Lu，Shan Zhen（PRC-BJN）Besov空间上的分数次积分的分解子”。数学学报.（英文）Ser.）20（2004），第3期，405--414。"
This paper was withdrawn by arXiv admin because it plagiarizes "Chen, Wen Gu(PRC-BIAP); Lu, Shan Zhen(PRC-BJN) The commutators of fractional integrals on Besov spaces. Acta Math. Sin. (Engl. Ser.) 20 (2004), no. 3, 405--414."
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Let $F^{2,m}(\mathbb{C})$ denote the Fock-Sobolev space of complex plane. In this paper, we characterize the semi-commutator of two Toeplitz operators on $F^{2,m}(\mathbb{C})$ is zero. The result is different from the result of Bauer, Choe, and Koo. (J. Funct. Anal., 268 (2015): 3017-3060.)
Characterisations of Sobolev spaces and constant functions over metric spaces
本文在满足Poincaré不等式的度量空间中，通过均振荡给出了Sobolev空间的新刻画，并扩展了常函数的特征，同时探讨了共轭算子的映射性质。
Let $(X,d,μ)$ denotes non-homogeneous metric measure space satisfying geometrically doubling and the upper doubling measure condition. In this paper, the boundedness in Lebesgue spaces for two kinds of commutators, which are iterated commutators and commutators in summation form, generated by multilinear strongly singular integral operators with RBMO$(μ)$ function on non-homogeneous metric measure spaces $(X,d,μ)$ is obtained.
We obtain some new characterizations of a variable version of Lipschitz spaces in terms of the boundedness of commutators of sharp maximal functions, fractional maximal functions or fractional maximal commutators in the context of the variable Lebesgue spaces, where the symbols of the commutators belong to the variable Lipschitz space. A useful tool is that a symbol $b$ belongs a variable Lipschitz space of pointwise type if and only if $b$ belongs to a variable Lipschitz space of integral type.
Commutators of Maximal Operators on Weighted Morrey Spaces
本文在齐型空间中的加权Morrey空间上，利用Hardy-Littlewood极大函数、sharp极大函数和分数极大函数的交换子刻画了BMO空间。
In this paper, we establish multilinear BMO estimates for commutators of multilinear fractional maximal and integral operators both on product generalized Morrey spaces and product generalized vanishing Morrey spaces, respectively. Similar results are still valid for commutators of multilinear maximal and singular integral operators.
We investigate the commutators $[b,I_ρ]$ of generalized fractional integral operators $I_ρ$ with functions $b$ in generalized Campanato spaces and give a necessary and sufficient condition for the boundedness of the commutators on Orlicz spaces. To do this we define Orlicz spaces with generalized Young functions and prove the boundedness of generalized fractional maximal operators on the Orlicz spaces.
Compactness of multilinear commutators generated by VMO functions and fractional integral operator on Morrey spaces
本文研究了由VMO函数和分数积分算子在Morrey空间中生成的多线性交换子的紧致性问题，通过分解tilde闭子空间来提升其紧致性。
Boundedness of oscillatory integral operators and their commutators on weighted Morrey spaces
证明了振荡积分算子和分数次振荡积分算子在加权Morrey空间上都是有界的.还考虑了由$BMO$函数生成的相应的迭代器。
In this paper, we investigate the boundedness of maximal operator and its commutators in generalized Orlicz-Morrey spaces on the spaces of homogeneous type. As an application of this boundedness, we give necessary and sufficient condition for the Adams type boundedness of fractional integral and its commutators in these spaces. We also discuss criteria for the boundedness of these operators in Orlicz spaces.
We establish the characterizations of commutators of several versions of maximal functions on spaces of homogeneous type. In addition, with the aid of interpolation theory, we provide weighted version of the commutator theorems by establishing new characterizations of the weighted BMO space. Finally, a concrete example shows the local version of commutators also has an independent interest.
In this paper we examine boundedness of fractional maximal operator. The main focus is on commutators and maximal commutators on generalized Orlicz spaces for fractional maximal functions and Riesz potentials. We prove their boundedness between generalized Orlicz spaces and give a characterization for functions of bounded mean oscillation. To best of our knowledge, these results are also new in the special case of double phase spaces.
In this article, we establish some conditions for the boundedness of fractional integral operators on the vanishing generalized weighted Morrey spaces. We also investigate corresponding commutators generated by BMO functions.
Weighted Lipschitz estiamtes for commutators of one-sided operators on one-sided Triebel-Lizorkin spaces
利用单侧权的外推，建立了加权Lipschitz函数和单侧奇异积分算子生成的算子从加权Lebesgue空间到加权单侧Triebel-Lizorkin空间的有界性.对于单侧离散平方函数的交换子也得到了相应的结果。
In this paper, we establish BMO estimates for generalized commutators of rough fractional maximal and integral operators on generalized weighted Morrey spaces, respectively.
This article provides a deeper study of the Riesz transform commutators associated with the Neumann Laplacian operator $Δ_N$ on $\mathbb R^n$. Along the line of singular value estimates for Riesz transform commutators established by Janson--Wolff and Rochberg--Semmes, we establish a full range of Schatten-$p$ class characterization for these commutators.
Some notes on commutators of the fractional maximal and Riesz potential operators on Orlicz spaces
本文研究分数阶极大函数和Riesz位势在Orlicz空间上的交换子有界性，在更宽松条件下获得了新结果。
In this paper we give BMO (bounded mean oscillation) space estimates for commutators of fractional type sublinear operators in generalized Morrey spaces on Heisenberg groups. The boundedness conditions are also formulated in terms of Zygmund type integral inequalities.
We give necessary and sufficient conditions for the boundedness of the maximal commutators $M_{b}$, the commutators of the maximal operator $[b, M]$ and the commutators of the sharp maximal operator $[b, M^{\sharp}]$ in Orlicz spaces $L^Φ(\mathbb{G})$ on any stratified Lie group $\mathbb{G}$ when $b$ belongs to Lipschitz spaces $\dotΛ_β(\mathbb{G})$. We obtain some new characterizations for certain subclasses of Lipschitz spaces $\dotΛ_β(\mathbb{G})$.
Boundedness of Commutators of Singular and Potential Operators in Generalized Grand Morrey Spaces and some applications
在齐性空间（X，d，μ）的背景下，证明了Calderon-Zygmund型算子的交换子以及位势算子与BMO函数的交换子在广义GrandMorrey空间中是有界的.在广义大Morrey空间的框架下，给出了椭圆型方程解的内估计.
In this paper, we find necessary and sufficient conditions for the boundedness of fractional maximal operator $M_α$ on Orlicz spaces. As an application of this results we consider the boundedness of fractional maximal commutator $M_{b,α}$ and nonlinear commutator of fractional maximal operator $[b,M_α]$ on Orlicz spaces, when $b$ belongs to the Lipschitz space, by which some new characterizations of the Lipschitz spaces are given.
This paper includes new bounds concepting the vanishing generalized weighted Morrey space. In this sense, it is outlined improved bounds about the a class of fractional type rough higher order commutators on vanishing generalized weighted Morrey spaces.
On off-diagonal operators in matrix-weighted spaces
研究矩阵加权空间中非对角算子，通过凸体控制理论证明分数阶算子及其交换子的矩阵加权不等式，给出相关定量估计及向量值函数的矩阵加权加利亚尔多 - 尼伦伯格 - 索伯列夫不等式。
Characterization of BMO spaces via commutators of fractional maximal function on Lorentz spaces
本文通过分数阶极大函数的极大交换子和非线性交换子在Lorentz空间上的有界性，给出了BMO空间子类的新的充分必要条件刻画。
We consider the commutators $[b,T]$ and $[b,I_ρ]$ on Orlicz-Morrey spaces, where $T$ is a Calderón-Zygmund operator, $I_ρ$ is a generalized fractional integral operator and $b$ is a function in generalized Campanato spaces. We give a necessary and sufficient condition for the boundedness of the commutators on Orlicz-Morrey spaces. To do this we prove the boundedness of generalized fractional maximal operators on Orlicz-Morrey spaces. Moreover, we introduce Orlicz-Campanato spaces and establish their relations to Orlicz-Morrey spaces.
Boundedness for commutators of fractional integrals on Herz-Morrey spaces with variable exponent
本文利用变指数和$\BMO$函数的一些性质，得到了变指数Herz-Morrey空间上分数次积分算子的有界性.
In this paper, the authors first discuss the characterization of Herz Triebel-Lizorkin spaces with variable exponent via two families of operators. By this characterization, the authors prove that the Lipschitz commutators of sublinear operators is bounded from Herz spaces with variable exponent to Herz Triebel-Lizorkin spaces with variable exponent. As an application, the corresponding boundedness estimates for the commutators of maximal operator, Riesz potential operator and Calderón-Zygmund operator are established.
In this paper, we give necessary and sufficient conditions for the boundedness of rough Hausdorff operators on Herz, Morrey and Morrey-Herz spaces with absolutely homogeneous weights. Especially, the estimates for operator norms in each case are worked out. Moreover, we also establish the boundedness of the commutators of rough Hausdorff operators on the such spaces with their symbols belonging to Lipschitz space.
In this paper, we obtain the necessary and sufficient conditions for the weak/strong boundedness of the Calderón-Zygmund operators in generalized weighted Orlicz-Morrey spaces. We also study the boundedness of the commutators of Calderón-Zygmund operators on these spaces. Moreover, the boundedness of Calderón-Zygmund operators in the vector-valued setting is given.
In this paper, we consider the boundedness of a class of sublinear operators and their commutators by with rough kernels associated with Calderon-Zygmund operator, Hard-Littlewood maximal operator, fractional integral operator, fractional maximal operator by with rough kernels both on vanishing generalized Morrey spaces and vanishing Morrey spaces, respectively.
Commutators of multilinear singular integral operators on non-homogeneous metric measure spaces
设$(X,d,μ)$是同时满足几何加倍测度和上加倍测度条件的度量测度空间，称之为非齐次度量测度空间.本文通过一个尖锐的极大算子，得到了在$m$ -重Lebesgue空间中的非齐次测度空间上，多线性奇异积分与$RBMO(μ)$函数生成的算子的有界性.
Endpoint estimates for commutators with respect to the fractional integral operators on Orlicz-Morrey spaces
本文研究分数次积分算子交换子的端点估计，将Cruz-Uribe与Fiorenza关于Orlicz空间弱型有界性的结果推广至Orlicz-Morrey空间。
In this paper, the main aim is to consider the boundedness of the Hardy-Littlewood maximal commutator $M_{b}$ and the nonlinear commutator $[b, M]$ on the Lebesgue spaces and Morrey spaces over some stratified Lie group $\mathbb{G}$ when $b$ belongs to the Lipschitz space, by which some new characterizations of the Lipschitz spaces on Lie group are given.
In this paper it is shown that the Hardy-Littlewood maximal operator $M$ is not bounded on Zygmund-Morrey space $\mathcal{M}_{L(\log L),λ}$, but $M$ is still bounded on $\mathcal{M}_{L(\log L),λ}$ for radially decreasing functions. The boundedness of the iterated maximal operator $M^2$ from $\mathcal{M}_{L(\log L),λ}$ to weak Zygmund-Morrey space ${\mathcal {W \! M}}_{L(\log L),λ}$ is proved. The class of functions for which the maximal commutator $C_b$ is bounded from $\mathcal{M}_{L(\log L),λ}$ to ${\mathcal {W \! M}}_{L(\log L),λ}$ are characterized. It is proved that the commutator of the …
In this paper, boundedness of Hausdorff operator on weak central Morrey space is obtained. Furthermore, we investigate the weak bounds of p- adic fractional Hausdorff Operator on weighted p-adic weak Lebesgue Space. We also obtain the sufficient condition of commutators of p-adic fractional Hausdorff Operator by taking symbol function from Lipschitz space. Moreover, strong type estimates for fractional Hausdorff Operator and its commutator on weighted p-adic Lorentz space are also acquired.
In this paper, we consider the boundedness of fractional type multilinear commutators generated by fractional integral with rough variable kernel and local Campanato functions on both generalized local (central) Morrey spaces and generalized vanishing local Morrey spaces, under generic size conditions which are satisfied by most of the operators in harmonic analysis, respectively.
For a prime number $p,$ let $\mathbb{Q}_p$ be the field of $p$-adic numbers. In this paper, we established the boundedness of a class of $p$-adic singular integral operators on the $p$-adic generalized Morrey spaces. The corresponding boundedness for the commutators generalized by the $p$-adic singular integral operators and $p$-adic Lipschitz functions or $p$-adic generalized Campanato functions is also considered.
The compactness of the commutators of bilinear fractional integral operators and point-wise multiplication, acting on products of Lebesgue spaces, is characterized in terms of appropriate mean oscillation properties of their symbols. The compactness of the commutators when acting on product of weighted Lebesgue spaces is also studied.
Boundedness of Intrinsic Square Functions and their Commutators on Generalized Orlicz-Morrey Spaces
研究了广义Orlicz-Morrey空间$M^{Φ,φ}(\mathbb{R}^n)$上的内在平方函数及其算子的有界性.在所有情况下的有界性的条件给出的Zygmund型积分不等式的重量$φ(x,r)$没有假设任何单调性性质的$φ(x,r)$上$r$。
In this paper, we give necessary conditions and sufficient conditions respectively for the boundedness of the singular integral operator on the weighted Morrey spaces. We observe the phenomenon unique to the case of Morrey spaces; the $A_q$-theory by Muckenhoupt and Wheeden does not suffice. We also discuss the boundedness of the commutators. The difference between the maximal operator and the singular integral operators will be clarified. Further, the property of the sharp maximal operator is investigated.
Extremal Domains for Self-Commutators in the Bergman Space
在arXiv：1305.5193v1中，作者证明了对于作用在Bergman空间$A^{2}(Ω)$上的具有解析符号$φ$的Toeplitz算子，Putnam不等式对于自洽算子的范数可以改进$\frac{1}{2}$。当$φ(Ω)$是圆盘时，这种改进的上界是尖锐的。在本文中，我们表明，磁盘是唯一的域的上界达到。
Boundedness of intrinsic square functions and their commutators on generalized weighted Orlicz-Morrey spaces
本文研究广义加权Orlicz-Morrey空间$M^{Φ,φ}_{w}({\mathbb R}^n)$上的内禀平方函数及其算子的有界性。在所有情况下，在不假设$x$固定的情况下，$φ(x,\cdot)$具有任何单调性的情况下，给出了关于权$φ$的Zygmund型积分不等式的有界性条件.
The aim of this paper is to introduce and study the boundedness of a new class of p-adic rough multilinear Hausdorff operators on the product of Herz, central Morrey and Morrey-Herz spaces with power weights and Muckenhoupt weights. We also establish the boundedness for the commutators of p-adic rough multilinear Hausdorff operators on the weighted spaces with symbols in central BMO space.
In this paper, we give the boundedness of some parabolic multilinear commutators generated by a class of parabolic maximal and linear operators with rough kernel and parabolic local Campanato functions on the parabolic generalized local Morrey spaces, respectively. Indeed, the results in this paper are extensions of some known results.
Dyadic fractional integral operators are shown to be bounded on Morrey spaces and their preduals. It seems that the proof of the boundedness by means of dyadic fractional integral operators is effective particularly on the preduals. In the present paper the commutators are proved to be bounded as well.
Singular Integrals and Commutators in Generalized Morrey Spaces
本文研究了在广义Morrey空间中可变Calderón-Zygmund型核奇异积分的连续性及交换子性质。
An RD-space $\mathcal{X}$ is a space of homogeneous type in the sense of Coifman and Weiss with the additional property that a reverse doubling property holds in $\mathcal{X}$. In this setting, the authors establish the boundedness of bilinear $θ$-type Calderón-Zygmund operator $T_θ$ and its commutator $[b_1,b_2,T_θ]$ generated by the function $b_1,b_2\in BMO(μ)$ and $T_θ$ on generalized weighted Morrey space $\mathcal{M}^{p,ϕ}(ω)$ and generalized weighted weak Morrey space $W\mathcal{M}^{p,ϕ}(ω)$ over RD-spaces.
Endpoint Estimates for N-dimensional Hardy Operators and Their Commutators
本文证明了高维Hardy算子从Hardy空间到Lebesgue空间是有界的。讨论了由Hardy算子和（中心）BMO函数生成的交换子的端点估计。
Let $T_m$ be the $m$-th Calderón-Zygmund type singular integral. In the paper, we consider the boundedness of $T_m$ on the generalized product local Morrey spaces $LM_{p_1,φ_1}^{\{x_0\}}\times LM_{p_2,φ_2}^{\{x_0\}}\times\dots\times LM_{p_m,φ_m}^{\{x_0\}}.$ And, the boundedness of the commutators of $T_m$ with local Campanato functions is obtained, also.
We study the ranks of commutators and generalized semicommutators of Toeplitz operators with quasihomogeneous symbols on both the harmonic Bergman space and the Bergman Space. In particular, when one of quasihomogeneous symbols is the the form of $e^{ikθ}r^{m}$, we first obtain specific sufficient and necessary conditions for commutators and generalized semicommutators to be finite rank. Then we make further efforts to determine the range of each finite rank commutator and generalized semicommutators, and consequently the explicit canonical form and the rank are obtained. Thus, the finite rank…
We provide a new characterization of homogeneous Besov and Sobolev spaces in Carnot groups using the fractional heat kernel and Poisson kernel. We apply our results to study commutators involving fractional powers of the sub-Laplacian.
In this paper, we establish the sharp boundedness of p-adic multilinear Hausdorff operators on the product of Lebesgue and central Morrey spaces associated with both power weights and Muckenhoupt weights. Moreover, the boundedness for the commutators of p-adic multilinear Hausdorff operators on the such spaces with symbols in central BMO space is also obtained.
Interpolation of Directional Banach Spaces and Commutator Estimates
该研究将复插值公式推广至方向巴拿赫空间，得到向量值函数矩阵加权空间的插值公式，应用于矩阵加权$L^p$空间插值，推导了相关类的推论与交换子估计，刻画了Muckenhoupt权的对数。
Let $Ω\subset \mathbb{R}^n$ be an unbounded open set. We consider the generalized weighted Morrey spaces $\mathcal{M}^{p(\cdot),φ}_ω(Ω)$ and the vanishing generalized weighted Morrey spaces $V\mathcal{M}^{p(\cdot),φ}_ω(Ω)$ with variable exponent $p(x)$ and a general function $φ(x,r)$ defining the Morrey-type norm. The main result of this paper are the boundedness of Riesz potential and its commutators on the spaces $\mathcal{M}^{p(\cdot),φ}_ω(Ω)$ and $V\mathcal{M}^{p(\cdot),φ}_ω(Ω)$. This result generalizes several existing results for Riesz potential and its commutators on Morrey type spaces.…
We prove that the weak Morrey space $WM^{p}_{q}$ is contained in the Morrey space $M^{p}_{q_{1}}$ for $1\leq q_{1}< q\leq p<\infty$. As applications, we show that if the commutator $[b,T]$ is bounded from $L^p$ to $L^{p,\infty}$ for some $p\in (1,\infty)$, then $b\in \mathrm{BMO}$, where $T$ is a Calderón-Zygmund operator. Also, for $1<p\leq q<\infty$, $b\in \mathrm{BMO}$ if and only if $[b,T]$ is bounded from $M^{p}_{q}$ to $WM_{q}^{p}$. For $b$ belonging to Lipschitz class, we obtain similar results.
In this paper, the authors establish the boundedness for a large class of intrinsic square functions $\mathcal{G}_α$, $g_α$, $g^{\ast}_{\tildeλ,α}$ and their commutators $[b,\mathcal{G}_α]$, $[b,g_α]$ and $[b,g^{\ast}_{\tildeλ,α}]$ generated with $λ$-central $BMO$ functions $b\in CBMO^{p,λ}(\mathbb{R}^{n})$ on generalized central Morrey spaces $\mathcal{B}^{q,φ}(\mathbb{R}^{n})$ for $1<q<\infty,0<α\leq1$, respectively. All of the results are new even on the central Morrey spaces $\mathcal{B}^{q,λ}(\mathbb{R}^{n})$.
Schatten properties of commutators on metric spaces
本文研究了度量空间中奇异积分与点乘算子的交换子属于Schatten类的条件，统一并扩展了不同特例下的已有结果，揭示了不同p值下交换子的Schatten性质与函数空间的关系。
Commutator Theorems for Fractional Integral Operators on Weighted Morrey Spaces
设$L$是具有高斯核界的$L^2(R^n)$上的解析半群的无穷小生成元，$L^{-α/2}$是$L$对于$0<α<n.$的分数次积分。对于任何局部可积函数$b$，与$L^{-α/2}$相关的算子定义为$[b,L^{-α/2}](f)(x)=b(x)L^{-α/2}(f)(x)-L^{-α/2}(bf)(x)$。当$b\in BMO(ω)$（加权$BMO$空间）或$b\in BMO$时，分别得到了$[b,L^{-α/2}]$在加权Morrey空间上有界的充要条件.
Some estimates for commutators of the fractional maximal function on stratified Lie groups
本文研究了分层李群上分数次极大交换子M_{α,b}与非线性交换子[b, M_α]在Lebesgue空间的有界性，并由此给出了Lipschitz空间的新刻画。
The Commutators of $n$-dimensional Rough Fractional Hardy Operators on Two Weighted Grand Herz-Morrey Spaces with Variable Exponents
研究证明了带粗糙核的 n 维分数 Hardy 算子及其伴随算子与 BMO 函数生成的 m 阶交换子在两类变指数加权大 Herz-Morrey 空间上的有界性。
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