Boundedness of Commutators with Lipschitz Functions in Non-homogeneous Spaces

Under the assumption that the underlying measure is a non-negative Radon measure which only satisfies some growth condition, the authors prove that for a class of commutators with Lipschitz functions which include commutators generated by Calderon-Zygmund operators and Lipschitz functions as examples, their boundedness in Lebesgue spaces or the Hardy space H1 (μ) is equivalent to some endpoint estimates satisfied by them. This result is new even when the underlying measureμis the d-dimensional Lebesgue measure.     

θ(t)型Calderón-Zygmund算子在非双倍测度下的有界性

本文研究了奇异积分算子在非双倍测度下的有界性问题,利用原子分解理论,证明了θ(t)型Calderón-Zygmund算子在非双倍测度下是从H1,∞atb(μ)到L1(μ)以及从L∞(μ)到RBMO(μ)有界的.这样,推广了Calderón-Zygmund算子在双倍测度下的空间有界性.     

Riesz Potentials in Besov and Triebel–Lizorkin Spaces over Spaces of Homogeneous Type

By using the discrete Calderón reproducing formulae, the author first establishes the boundedness of the Riesz-potential-type operator in homogeneous Besov and Triebel–Lizorkin spaces over spaces of homogeneous type. Then, by use of the T1 theorems for these spaces, the author proves that this operator of Riesz potential type can be used as the lifting operator of these spaces.     

Marcinkiewicz积分在非齐型Morrey-Herz空间中的有界性

在非齐型Morrey-Herz空间MK_(p,q)~(α,λ)(μ)中建立了Marcinkiewicz积分算子的有界性,并给出了相应的端点估计.     

Boundedness of commutators on Hardy type spaces

Let [b, T] be the commutator of the function b ∈ Lipβ(Rn) (0 ＜β≤ 1) and the CalderónZygmund singular integral operator T. The authors study the boundedness properties of [b, T] on the classical Hardy spaces and the Herz-type Hardy spaces in non-extreme cases. For the boundedness of these commutators in extreme cases, some characterizations are also given. Moreover, the authors prove that these commutators are bounded from Hardy type spaces to the weak Lebesgue or Herz spaces in extreme cases.     

球面Hardy空间上Riesz平均的逼近

引进了球面Hrady空间上Riesz平均算子及Peetre K模。讨论了Riesz平均算子在Hardy空间上的逼近性质。证明了Riesz平均算子与Peetre K模的强渐近等价关系。所得结果表明Peetre K模完全刻划了Riesz平均的逼近。     

Generalized Bessel and Riesz Potentials on Metric Measure Spaces

We introduce generalized Bessel and Riesz potentials on metric measure spaces and the corresponding potential spaces. Estimates of the Bessel and Riesz kernels are given which reflect the intrinsic structure of the spaces. Finally, we state the relationship between Bessel (or Riesz) operators and subordinate semigroups.      

非齐型空间中一类次线性算子的交换子在Morrey—Herz空间上的有界性

讨论了非齐型空间中由一类次线性算子分别与RBMO函数以及Lipschitz函数生成的交换子在Morrey—Herz空间上的有界性,证明了交换子从MKp1,q1^α,λ（μ）的有界性,以及从MKp1,q1^n（1-1/q1）,λ（μ）到WMKp2,q2^（1-1/q1）,λ（μ）的有界性。     

基本的局部实心Riesz空间

In this paper we focus ourselves on the positive cone of the locally solid Riesz spaces to characterize the fundamentality.From one example the article indicates that the fundamentality of the locally solid Riesz space is independent from the Lebesgue property.     

Necessary and Sufficient Conditions for the Boundedness of the Riesz Potential in Local Morrey-type Spaces

The problem of the boundedness of the Riesz potential I _α , 0 < α < n, in local Morrey-type spaces is reduced to the boundedness of the Hardy operator in weighted L _p -spaces on the cone of non-negative non-increasing functions. This allows obtaining sufficient conditions for the boundedness in local Morrey-type spaces for all admissible values of the parameters. Moreover, for a certain range of the parameters, these sufficient conditions coincide with the necessary ones. V. Guliyev’s research was partially supported by the grant of the Azerbaijan-U. S. Bilateral Grants Program II (project ANSF Award / AZM1-3110-BA-08) and the Turkish Scientific and Technological Research Council (TUBITAK, programme 2221, no. 220.01-619-4889).     

紧致齐性空间上的调和分析（Ⅳ）─—Riesz变换与Bessel变换

本文研究了紧致齐性空间上的Ｒｉｅｓｚ位势算子与Ｂｅｓｓｅｌ位势算子，Ｒｉｅｓｚ变换与Ｂｅｓｓｅｌ变换，给出了上述算子对应的核函数的具体构造并证明了Ｒｉｅｓｚ变换与Ｂｅｓｓｅｌ变换作为奇异积分算子的Ｈ￣ｐ有界性，ｐ＞０。     

On Relations Between Bessel Potential Spaces and Riesz Potential Spaces

We present a relation between the Bessel potential spaces and the Riesz potential spaces. The ideas of the proof are to characterize each potential spaces and to give a correspondence between individual Bessel potentials and Riesz potentials.     

Boundedness of Some Maximal Commutators in Hardy-type Spaces with Non-doubling Measures

Let μ be a non-negative Radon measure on R^d which satisfies only some growth conditions. Under this assumption, the boundedness in some Hardy-type spaces is established for a class of maximal Calderón-Zygmund operators and maximal commutators which are variants of the usual maximal commutators generated by Calder6ón- Zygmund operators and RBMO（μ） functions, where the Hardytype spaces are some appropriate subspaces, associated with the considered RBMO（μ） functions, of the Hardv soace H^I（μ） of Tolsa.     

Compactness of Commutators of Riesz Potential on Morrey Spaces

In this paper, the authors give a characterization of the (L ^{p, λ} , L ^{q, λ} )-compactness for the Riesz potential commutator [b,I _α ]. More precisely, the authors prove that the commutator [b,I _α ] is a compact operator from the Morrey space L ^{p, λ} (ℝ ⁿ ) to L ^{q, λ} (ℝ ⁿ ) if and only if b ∈ VMO(ℝ ⁿ ), the BMO-closure of . The research was supported by NSF of China (Grant: 10571015, 10826046) and SRFDP of China (Grant: 20050027025).     

非齐型齐次Morrey-Herz空间中某些次线性算子和交换子的有界性

在非齐型齐次Morrey—Herz空间MKp,q^α,λ（μ）中建立了某些次线性算子的有界性,同时利用Calderon-Zygmund算子的L^2（μ）有界性,在MKp,q^α,λ（μ）上证明了由Calderon—Zygmund算子和RBMO（μ）函数生成的交换子的有界性．     

Pointfree Spectra of Riesz Spaces

One of the best ways of studying ordered algebraic structures is through their spectra. The three well-known spectra usually considered are the Brumfiel, Keimel, and the maximal spectra. The pointfree versions of these spectra were studied by B. Banaschewski for f-rings. Here, we give the pointfree versions of the Keimel and the maximal spectra for Riesz spaces. Moreover, we briefly mention how one can use the results of this paper to give a pointfree version of the Kakutani duality for Riesz spaces.     

Boundedness of Marcinkiewicz integrals and their commutators in H1(Rn×Rm)

The authors establish the boundedness of Marcinkiewicz integrals from the Hardy space H1(Rn × Rm) to the Lebesgue space L1(Rn × Rm) and their commutators with Lipschitz functions from the Hardy space H1(Rn × Rm) to the Lebesgue space Lq(Rn × Rm) for some q＞1.     

The Orlicz-Pettis theorem for topological Riesz spaces

A finitely additive vector measure from a -ring to a Riesz space is countably additive (exhaustive) for all Hausdorff Lebesgue topologies on the range space, or for none of them. In particular, subseries convergent series are the same for all Hausdorff Lebesgue topologies on a Riesz space.

     

非齐型空间上齐次Morrey-Herz空间中分数次多线性交换子的有界性

在非齐型齐次Morrey-Herz空间上得到了一类由分数次积分算子和RBMO(μ)函数生成的多线性交换子的有界性结果.     

具有非倍测度的参数型Marcinkiewicz积分交换子在Hardy空间的有界性

主要证明了由参数型Marcinkiewicz积分M~p和Lipschitz函数b生成的交换子M_b~p的有界性.在M的核满足一定的条件下,证明了M_b~p不仅从Lebesgue空间L~(n/(n-β))(μ)到Hardy空间H~1(μ)有界,而且从Lebesgue空间L~(n/β)(μ)到RBMO(μ)有界.