Let Ω be homogeneous of degree zero,integrable on S^(n−1) and have mean value zero,T_(Ω) be the homogeneous singular integral operator with kernel Ω(x)/|x|^(n) and[b,T_(Ω)]be the commutator of T_(Ω)with symbol b∈BMO(...Let Ω be homogeneous of degree zero,integrable on S^(n−1) and have mean value zero,T_(Ω) be the homogeneous singular integral operator with kernel Ω(x)/|x|^(n) and[b,T_(Ω)]be the commutator of T_(Ω)with symbol b∈BMO(R^(n)).In this paper,the authors prove that if sup ζ∈S^(n−1)∫Sn−1^(|Ω(θ)|log^(β)(1/|θ·ζ|)dθ<∞ with β>2,then[b,T_(Ω)]is bounded on Triebel–Lizorkin space F^(0,q)p(R^(n))provided that 1+1/β−1<p,q<β.展开更多
Lp(Rn) (1<p<∞) boundedness and a weak type endpoint estimate are considered for the commutators of singular integral operators. A condition on the associated kernel is given under which the L2(Rn) boundedness o...Lp(Rn) (1<p<∞) boundedness and a weak type endpoint estimate are considered for the commutators of singular integral operators. A condition on the associated kernel is given under which the L2(Rn) boundedness of the singular integral operators implies the LP(Rn) boundedness (1<p<∞) and the weak type (H1(Rn), L1(Rn)) boundedness for the corresponding commutators. A new interpolation theorem is also established.展开更多
Let （X, d,u） be a space of homogeneous type, BMOA（X） and LiPA（β, X） be the space of BMO type, lipschitz type associated with an approximation to the identity {At}t〉0 and introduced by Duong, Yah and Tang, resp...Let （X, d,u） be a space of homogeneous type, BMOA（X） and LiPA（β, X） be the space of BMO type, lipschitz type associated with an approximation to the identity {At}t〉0 and introduced by Duong, Yah and Tang, respectively. Assuming that T is a bounded linear operator on L2（X）, we find the sufficient condition on the kernel oft so that T is bounded from BMO （X） to BMOA （X） and from Lip（β, X） to LiPA （β, X）. As an application, the boundedness of Calder6n-Zygmund operators with nonsmooth kernels on BMO（Rn） and Lip（β, Rn） are also obtained.展开更多
The Fourier transform and the Littlewood-Paley theory are used to give the weighted boundedness of a strongly singular integral operator defined in this paper. The paper shows that the strongly singular integral opera...The Fourier transform and the Littlewood-Paley theory are used to give the weighted boundedness of a strongly singular integral operator defined in this paper. The paper shows that the strongly singular integral operator is bounded from the Sobolev space to the Lebesgue space.展开更多
In this paper, some approximation formulae for a class of convolution type double singular integral operators depending on three parameters of the type(T_λf)(x, y) = ∫_a^b ∫_a^b f(t, s)K_λ(t-x,s-y)dsdt, x,y ∈(a,...In this paper, some approximation formulae for a class of convolution type double singular integral operators depending on three parameters of the type(T_λf)(x, y) = ∫_a^b ∫_a^b f(t, s)K_λ(t-x,s-y)dsdt, x,y ∈(a,b), λ ∈ Λ [0,∞),(0.1)are given. Here f belongs to the function space L_1( <a,b >~2), where <a,b> is an arbitrary interval in R. In this paper three theorems are proved, one for existence of the operator(T_λf)(x, y) and the others for its Fatou-type pointwise convergence to f(x_0, y_0), as(x,y,λ) tends to(x_0, y_0, λ_0). In contrast to previous works, the kernel functions K_λ(u,v)don't have to be 2π-periodic, positive, even and radial. Our results improve and extend some of the previous results of [1, 6, 8, 10, 11, 13] in three dimensional frame and especially the very recent paper [15].展开更多
In this paper,the author discusses some singular integral operators,singular quadrature operators and discretization matrices associated with singular integral equations with Cauchy kernels,and obtain some useful prop...In this paper,the author discusses some singular integral operators,singular quadrature operators and discretization matrices associated with singular integral equations with Cauchy kernels,and obtain some useful properties for them.These results improve both the classical theory of singular integral equation and the classical theory of singular quadrature.展开更多
It is proved that, for the nondivergence elliptic equations Σi,jn=1aijuxixj=f, if f belongs to the generalized Morrey spaces Lp, (w), then uxixj ∈ Lp, (w), where u is the W2,p-solution of the equations. In order to ...It is proved that, for the nondivergence elliptic equations Σi,jn=1aijuxixj=f, if f belongs to the generalized Morrey spaces Lp, (w), then uxixj ∈ Lp, (w), where u is the W2,p-solution of the equations. In order to obtain this, the author first establish the weighted boundedness for the commutators of some singular integral operators on Lp, (w).展开更多
On the basis of the Cauchy integral formulas for regular and biregular functions, we define some Cauchy-type singular integral operators. Then we discuss the Holder continuous property of some singular integral operat...On the basis of the Cauchy integral formulas for regular and biregular functions, we define some Cauchy-type singular integral operators. Then we discuss the Holder continuous property of some singular integral operators with one integral variable. Then we divide a singular integral operator with two variables into three parts and prove its Holder continuous property on the boundary.展开更多
The main purpose of this paper is to characterize the Lipschitz space by the boundedness of commutators on Lebesgue spaces and Triebel-Lizorkin spaces with variable exponent.Based on this main purpose,we first charact...The main purpose of this paper is to characterize the Lipschitz space by the boundedness of commutators on Lebesgue spaces and Triebel-Lizorkin spaces with variable exponent.Based on this main purpose,we first characterize the Triebel-Lizorkin spaces with variable exponent by two families of operators.Immediately after,applying the characterizations of TriebelLizorkin space with variable exponent,we obtain that b∈∧βif and only if the commutator of Calderon-Zygmund singular integral operator is bounded,respectively,from L^p(·)(R^n)toF^β,∞p(·),fromL^p(·)(R^n)toL^q(·)(R^n)with1/p(·)-1/q(·)=β/n.Moreover,we prove that the commutator of Riesz potential operator also has corresponding results.展开更多
In this paper, we establish the boundedness of commutators of singular integral operators with non-smooth kernels on weighted Lipschitz spaces Lipβ,ω. The condition on the kernel in this paper is weaker than the usu...In this paper, we establish the boundedness of commutators of singular integral operators with non-smooth kernels on weighted Lipschitz spaces Lipβ,ω. The condition on the kernel in this paper is weaker than the usual pointwise HSrmander condition.展开更多
In this paper,a kind of new definitions of singular integral operators in the weighted L^(2) space with the generalized Jacobi weights are given,then the boundedness in the weighted L^(2) space,the relationships betwe...In this paper,a kind of new definitions of singular integral operators in the weighted L^(2) space with the generalized Jacobi weights are given,then the boundedness in the weighted L^(2) space,the relationships between these operators and the classic singular integral operators are proved.For the convenience in the later use,similar results in the L^(2) space with Jacobi weights are given.展开更多
Let X be a space of homogeneous type with finite measure. Let T be a singular integral operator which is bounded on L^p （X）, 1 〈 p 〈 ∞. We give a sufficient condition on the kernel k（x,y） of Tso thatwhen a func...Let X be a space of homogeneous type with finite measure. Let T be a singular integral operator which is bounded on L^p （X）, 1 〈 p 〈 ∞. We give a sufficient condition on the kernel k（x,y） of Tso thatwhen a function b ∈ BMO （X）,the commutator [b,T] （f）=T （b f）- bT （f） is bounded on spaces L^p for all p, 1 〈 p 〈 ∞.展开更多
In this paper, some mapping properties are considered for the maximal multilinear singular integral operator whose kernel satisfies certain minimum regularity condition. It is proved that certain uniform local estimat...In this paper, some mapping properties are considered for the maximal multilinear singular integral operator whose kernel satisfies certain minimum regularity condition. It is proved that certain uniform local estimate for doubly truncated operators implies the L^P（R^n） （1 〈 p 〈 ∞） boundedness and a weak type LlogL estimate for the corresponding maximal operator.展开更多
In this paper, weighted estimates with general weights are established for the multilinear singular integral operator defined by TAf（x）=p.v.∫R^n Ω（x-y）/｜x-y）^n＋1（A（x）-A（y）-△↓A（y）（x-y）f（y）dywhere ...In this paper, weighted estimates with general weights are established for the multilinear singular integral operator defined by TAf（x）=p.v.∫R^n Ω（x-y）/｜x-y）^n＋1（A（x）-A（y）-△↓A（y）（x-y）f（y）dywhere fl is homogeneous of degree zero, has vanishing moment of order one, and belongs to Lipγ（S^n-1） with γ∈ （0, 1], A has derivatives of order one in BMO（R^n）.展开更多
LP(Rn) boundedness is considered for the multilinear singular integral operator defined by where Ω is homogeneous of degree zero, integrable on the unit sphere and has vanishing moment of order one. A has derivatives...LP(Rn) boundedness is considered for the multilinear singular integral operator defined by where Ω is homogeneous of degree zero, integrable on the unit sphere and has vanishing moment of order one. A has derivatives of order one in BMO(Rn). We give a smoothness condition which is fairly weaker than that Ω∈Lipαt(Sn-1) (0 <α≤1) and implies the LP(Rn) (1 < p <∞) boundedness for the operator TA.Some endpoint estimates are also established.展开更多
This paper defines a class of singular integral operators(I))_(wj)on L_(wj)^(2)space,where wights w_(j)(j=1-4)are lour kinds of Chebyshev weights.The authors prove that(I)over tilde(wj)is an unique linear extension of...This paper defines a class of singular integral operators(I))_(wj)on L_(wj)^(2)space,where wights w_(j)(j=1-4)are lour kinds of Chebyshev weights.The authors prove that(I)over tilde(wj)is an unique linear extension of classic singular integral operator I_(wj)on Holder space,some important properties of I_(wj)and some results of singular integral equation in L_(wj)^(2)space.展开更多
In this paper, we obtain the exact norm of a class of singular integral operators Qα, α 〉 0, defined by Qαf（z） = α∫D（f（w）/（1-zw）（α＋1））dA（w）,from L∞（D） onto Bloch-type space Bα over the unit dis...In this paper, we obtain the exact norm of a class of singular integral operators Qα, α 〉 0, defined by Qαf（z） = α∫D（f（w）/（1-zw）（α＋1））dA（w）,from L∞（D） onto Bloch-type space Bα over the unit disk D, which is an extension of the Bergman projection P. We also consider the norm for this operator from C（D） onto the little Bloch-type space B（α,0）.展开更多
In this paper, we study a kind of oscillatory singular integral operator T with Calderon-Zygmund kernel, which had been studied by Ricci and Stein in [6], and extend their result. We get that T is bounded on L^P（R^...In this paper, we study a kind of oscillatory singular integral operator T with Calderon-Zygmund kernel, which had been studied by Ricci and Stein in [6], and extend their result. We get that T is bounded on L^P（R^n）（1〈p〈∞） when -1〈u〈 αd（1/2-｜1/p-1/2）.展开更多
基金Supported by NSFC(No.11971295)Guangdong Higher Education Teaching Reform Project(No.2023307)。
文摘Let Ω be homogeneous of degree zero,integrable on S^(n−1) and have mean value zero,T_(Ω) be the homogeneous singular integral operator with kernel Ω(x)/|x|^(n) and[b,T_(Ω)]be the commutator of T_(Ω)with symbol b∈BMO(R^(n)).In this paper,the authors prove that if sup ζ∈S^(n−1)∫Sn−1^(|Ω(θ)|log^(β)(1/|θ·ζ|)dθ<∞ with β>2,then[b,T_(Ω)]is bounded on Triebel–Lizorkin space F^(0,q)p(R^(n))provided that 1+1/β−1<p,q<β.
基金This research was supported by the NNSF of China (10271015)
文摘Lp(Rn) (1<p<∞) boundedness and a weak type endpoint estimate are considered for the commutators of singular integral operators. A condition on the associated kernel is given under which the L2(Rn) boundedness of the singular integral operators implies the LP(Rn) boundedness (1<p<∞) and the weak type (H1(Rn), L1(Rn)) boundedness for the corresponding commutators. A new interpolation theorem is also established.
基金Supported by the National Natural Science Foundation of China(Grant Nos.1126105511161044)
文摘Let （X, d,u） be a space of homogeneous type, BMOA（X） and LiPA（β, X） be the space of BMO type, lipschitz type associated with an approximation to the identity {At}t〉0 and introduced by Duong, Yah and Tang, respectively. Assuming that T is a bounded linear operator on L2（X）, we find the sufficient condition on the kernel oft so that T is bounded from BMO （X） to BMOA （X） and from Lip（β, X） to LiPA （β, X）. As an application, the boundedness of Calder6n-Zygmund operators with nonsmooth kernels on BMO（Rn） and Lip（β, Rn） are also obtained.
基金Project supported by the National Natural Science Foundation of China (No. 10771110)the Major Project of the Ministry of Education of China (No. 309018)
文摘The Fourier transform and the Littlewood-Paley theory are used to give the weighted boundedness of a strongly singular integral operator defined in this paper. The paper shows that the strongly singular integral operator is bounded from the Sobolev space to the Lebesgue space.
文摘In this paper, some approximation formulae for a class of convolution type double singular integral operators depending on three parameters of the type(T_λf)(x, y) = ∫_a^b ∫_a^b f(t, s)K_λ(t-x,s-y)dsdt, x,y ∈(a,b), λ ∈ Λ [0,∞),(0.1)are given. Here f belongs to the function space L_1( <a,b >~2), where <a,b> is an arbitrary interval in R. In this paper three theorems are proved, one for existence of the operator(T_λf)(x, y) and the others for its Fatou-type pointwise convergence to f(x_0, y_0), as(x,y,λ) tends to(x_0, y_0, λ_0). In contrast to previous works, the kernel functions K_λ(u,v)don't have to be 2π-periodic, positive, even and radial. Our results improve and extend some of the previous results of [1, 6, 8, 10, 11, 13] in three dimensional frame and especially the very recent paper [15].
基金Supported by the Netional Natural Science Foundation of China and the Foundation of the State Education Commission of China.
文摘In this paper,the author discusses some singular integral operators,singular quadrature operators and discretization matrices associated with singular integral equations with Cauchy kernels,and obtain some useful properties for them.These results improve both the classical theory of singular integral equation and the classical theory of singular quadrature.
文摘It is proved that, for the nondivergence elliptic equations Σi,jn=1aijuxixj=f, if f belongs to the generalized Morrey spaces Lp, (w), then uxixj ∈ Lp, (w), where u is the W2,p-solution of the equations. In order to obtain this, the author first establish the weighted boundedness for the commutators of some singular integral operators on Lp, (w).
基金Supported by the National Natural Science Foundation of China (10771049, 10801043)the Hebei Natural Science Foundation (A2007000225, A2010000346)
文摘On the basis of the Cauchy integral formulas for regular and biregular functions, we define some Cauchy-type singular integral operators. Then we discuss the Holder continuous property of some singular integral operators with one integral variable. Then we divide a singular integral operator with two variables into three parts and prove its Holder continuous property on the boundary.
基金Supported by the Natural Science Foundation of Xinjiang Uygur Autonomous Region(Grant Nos.2019D01C334,2016D01C381)the National Natural Science Foundation of China(Grant No.11661075)。
文摘The main purpose of this paper is to characterize the Lipschitz space by the boundedness of commutators on Lebesgue spaces and Triebel-Lizorkin spaces with variable exponent.Based on this main purpose,we first characterize the Triebel-Lizorkin spaces with variable exponent by two families of operators.Immediately after,applying the characterizations of TriebelLizorkin space with variable exponent,we obtain that b∈∧βif and only if the commutator of Calderon-Zygmund singular integral operator is bounded,respectively,from L^p(·)(R^n)toF^β,∞p(·),fromL^p(·)(R^n)toL^q(·)(R^n)with1/p(·)-1/q(·)=β/n.Moreover,we prove that the commutator of Riesz potential operator also has corresponding results.
文摘In this paper, we establish the boundedness of commutators of singular integral operators with non-smooth kernels on weighted Lipschitz spaces Lipβ,ω. The condition on the kernel in this paper is weaker than the usual pointwise HSrmander condition.
基金Supported by the Foundation of TY of China(10126028)
文摘In this paper,a kind of new definitions of singular integral operators in the weighted L^(2) space with the generalized Jacobi weights are given,then the boundedness in the weighted L^(2) space,the relationships between these operators and the classic singular integral operators are proved.For the convenience in the later use,similar results in the L^(2) space with Jacobi weights are given.
基金Supported by the National Natural Science Foundation of China
文摘Let X be a space of homogeneous type with finite measure. Let T be a singular integral operator which is bounded on L^p （X）, 1 〈 p 〈 ∞. We give a sufficient condition on the kernel k（x,y） of Tso thatwhen a function b ∈ BMO （X）,the commutator [b,T] （f）=T （b f）- bT （f） is bounded on spaces L^p for all p, 1 〈 p 〈 ∞.
文摘In this paper, some mapping properties are considered for the maximal multilinear singular integral operator whose kernel satisfies certain minimum regularity condition. It is proved that certain uniform local estimate for doubly truncated operators implies the L^P（R^n） （1 〈 p 〈 ∞） boundedness and a weak type LlogL estimate for the corresponding maximal operator.
文摘In this paper, weighted estimates with general weights are established for the multilinear singular integral operator defined by TAf（x）=p.v.∫R^n Ω（x-y）/｜x-y）^n＋1（A（x）-A（y）-△↓A（y）（x-y）f（y）dywhere fl is homogeneous of degree zero, has vanishing moment of order one, and belongs to Lipγ（S^n-1） with γ∈ （0, 1], A has derivatives of order one in BMO（R^n）.
文摘LP(Rn) boundedness is considered for the multilinear singular integral operator defined by where Ω is homogeneous of degree zero, integrable on the unit sphere and has vanishing moment of order one. A has derivatives of order one in BMO(Rn). We give a smoothness condition which is fairly weaker than that Ω∈Lipαt(Sn-1) (0 <α≤1) and implies the LP(Rn) (1 < p <∞) boundedness for the operator TA.Some endpoint estimates are also established.
基金Supored by the Nasiomn Committee of Science&Techology and tbe Funds of the State Eduation Comision of China
文摘This paper defines a class of singular integral operators(I))_(wj)on L_(wj)^(2)space,where wights w_(j)(j=1-4)are lour kinds of Chebyshev weights.The authors prove that(I)over tilde(wj)is an unique linear extension of classic singular integral operator I_(wj)on Holder space,some important properties of I_(wj)and some results of singular integral equation in L_(wj)^(2)space.
基金Supported by the Natural Science Foundation of Zhejiang Province(Grant No.LY14A010021)
文摘In this paper, we obtain the exact norm of a class of singular integral operators Qα, α 〉 0, defined by Qαf（z） = α∫D（f（w）/（1-zw）（α＋1））dA（w）,from L∞（D） onto Bloch-type space Bα over the unit disk D, which is an extension of the Bergman projection P. We also consider the norm for this operator from C（D） onto the little Bloch-type space B（α,0）.
文摘In this paper, we study a kind of oscillatory singular integral operator T with Calderon-Zygmund kernel, which had been studied by Ricci and Stein in [6], and extend their result. We get that T is bounded on L^P（R^n）（1〈p〈∞） when -1〈u〈 αd（1/2-｜1/p-1/2）.
基金Project 10671062 is supported by NSF of China,Project 11071065 is supported by NSF of ChinaProject 20094306110004 supported by RFDP of high education of China and Supported by the Program for Science and Technology Research Team in Higher Educational Institutions of Hunan Province
文摘In this paper, we extend Hu and Zhang＇s results in [2] to different case.
