关于实Hardy空间上的乘子

设H^p(Rⁿ)(00一致有界的乘子族,那么m为H^p(Tⁿ)乘子。并且由此得到了H^p(Tⁿ)乘子在低维空间上的限制性定理。     

函数空间以及一类奇异积分算子在Hr(Rn)(p＜r≤1)中有界性的准则

在经典H^p(Rⁿ)空间原子分解理论基础上,给出了一种H^p(Rⁿ)空间的新的更为精细的刻划,籍此,给出了一类异奇积分算子在所有H^r(Rⁿ)(p＜r≤1)中有界性的准则     

Sobolev空间的实内插

本文求出了Sobolev空间L_k^∞,BMO_k与L_k^p,H_k^p(0 < p < ∞)之间的实内插空间.     

相伴于平方根算子的Hp空间

本文利用椭圆算子的平方根所生成的热核给出了H^p空间的极大函数刻画。     

有界对称域上Hp函数的系数乘子

用乘子语言来刻画全纯函数的Taylor系数的方法,将Duren和Shields所得H^p到l^q(0<p<1,p≤q≤∞)乘子的充分必要条件推广到Cⁿ中有界对称上H^p空间,在q》2时,所得到结论不能再改进,而对q<2则是另一种乘子刻画,文中还用函数平均值的增长性来刻画H^p到H^q(0<p<q<∞)的乘子.     

非交换Hp空间理论的若干进展——纪念李国平院士吴新谋教授诞辰100周年

该文分两部分综述非交换H_p 空间理论的研究背景、发展线路以及某些最新进展.第一部分介绍非交换Hardy 空间理论, 包括有限次对角代数的基本性质 (如唯一正规态开拓性质、分解性质、对数模性、不变子空间性质等),Szeg\"{o} 与Riesz 型分解定理和H¹-BMO 对偶定理等. 第二部分综述非交换 H_p鞅空间理论, 主要介绍各种非交换鞅不等式以及作者与合作者在非交换Hardy 鞅空间原子分解方面获得的最新结果. 该文还给出了非交换H_p空间理论有待解决的一些问题 和潜在的发展方向.     

关于复平面上H∞空间,βp空间以及β0p空间的几个问题

本文讨论了单位圆中Hardy空间H^∞到p-Bloch空间β^p的复合算子T_1,φ加权复合算子T_ψ,φ的有界性,也讨论了H^∞到小p-Bloch空间β₀^p的复合算子T_1,φ的有界性问题;另外还讨论了小p-Bloch空间到H^∞空间的点乘子及小p-Bloch空间上复合算子的紧性等.     

θ(t)-Calderón-Zygmund算子在群上的Hardy空间Hp(G)中的有界性

设G为局部域K上的2n＋1维Heisenberg群,文献［1］给出了一类Hardy空间H^p(G),(0p(G)(0相似文献   

RD-空间上Hardy空间的极大函数特征及其应用

令χ为RD-空间, 即Coifman和Weiss意义下的齐型空间且满足逆双倍条件. 设$\cx$具有“维数”n. 对α∈(0,∞), 分别记$H_\az^p(\cx)$, $H_{\rm d}^p(\cx)$和$H^{\ast,\, p}(\cx)$为$\cx$上相应于非切向极大函数, 二进极大函数和主极大函数的Hardy空间. 利用一个新建立的Calderón再生公式, 证明了当p∈ (1,∞]时这些Hardy空间等价于L^p(χ)及当p∈(n/(n+1), 1]时这些Hardy空间彼此等价. 对 p∈(n/(n+1), 1], 建立了H^*,p}(χ) 的原子特征刻画; 进一步, 当p∈(n/(n+1), 1]时, 证明了H^*,p(χ)与Coifman和Weiss意义下的原子Hardy空间等价. 此外, 证明了一个次线性算子T可以唯一延拓为H^p(χ)到某拟Banach空间B的有界算子当且仅当$T$将所有的(p, q)-原子, q∈(p, ∞)∩[1, ∞], 或者连续的(p,∞)-原子映为B中的一致有界集.     

Hp(Rn×R+)(1<p<+∞)函数得渐近行为*

H^p(Rⁿ×R₊)(1<p<+∞)函数得渐近行为于70年代已获得整体上的描述,今利用扩张得空间EH^p(Rⁿ×R₊)的不同层次间的内在关联,给出每个层次H^p函数的具体的渐近行为,以及EH^p函数在整体上得渐近行为.     

Planar and affine spaces

In this note, we characterize finite three-dimensional affine spaces as the only linear spaces endowed with set Ω of proper subspaces having the properties (1) every line contains a constant number of points, say n, with n>2; (2) every triple of noncollinear points is contained in a unique member of Ω; (3) disjoint or coincide is an equivalence relation in Ω with the additional property that every equivalence class covers all points. We also take a look at the case n=2 (in which case we have a complete graph endowed with a set Ω of proper complete subgraphs) and classify these objects: besides the affine 3-space of order 2, two small additional examples turn up. Furthermore, we generalize our result in the case of dimension greater than three to obtain a characterization of all finite affine spaces of dimension at least 3 with lines of size at least 3.     

On the embedding of BV space into Besov-Orlicz space

We give a sufficient (and, in the case of a compact domain, a necessary) condition for the embedding of Sobolev space of functions with integrable gradient into Besov-Orlicz spaces to be bounded. The condition has a form of a simple integral inequality involving Young and weight functions. We provide an example with Matuszewska-Orlicz indices of involved Orlicz norm equal to one. The main tool is the molecular decomposition of functions from a BV space.     

Corrigendum to “Characterization of Sobolev and BV spaces” [J. Funct. Anal. 261 (10) (2011) 2926–2958]

We correct a mistake in [3].     

Countable compact Hausdorff spaces need not be metrizable in ZF

We show that the existence of a countable, first countable, zero-dimensional, compact Hausdorff space which is not second countable, hence not metrizable, is consistent with ZF.

     

初始的L-外部空间

研究了初始的L-外部空间.构造了L-外部空间范畴的初始结构,并由此定义了L-外部空间的乘积结构和子空间结构,证明了L-外部空间范畴是L-预外部空间范畴的余反射子范畴.     

The classical Banach spaces

In this paper we study some structural and geometric properties of the quotient Banach spaces , where is an arbitrary set, is an Orlicz function, is the corresponding Orlicz space on and , being the ideal of elements with finite support. The results we obtain here extend and complete the ones obtained by Leonard and Whitfield (Rocky Mountain J. Math. 13 (1983), 531-539). We show that is not a dual space, that , if for every , that has no smooth points, that it cannot be renormed equivalently with a strictly convex or smooth norm, that is a Grothendieck space, etc.

     

关于rectifiable空间中的局部(序列)连通性的几个注记

给出连通的rectifiable空间是局部序列连通(或局部连通)的刻画,推广了拓扑群中的相应结果;利用rectifiable空间G中e的局部邻域基给出G是局部连通(或局部序列连通)的刻画;证明了若A是rectifiable空间G中的序列开子集,那么H=A是G的序列开rectifiable子空间.     

Higher-order symmetrization inequalities and applications

We prove new extended forms of the Pólya-Szegö symmetrization principle. As a consequence new sharp embedding theorems for generalized Sobolev and Besov spaces are proved.     

Symmetrization inequalities in the fractional case and Besov embeddings

We prove new extended forms of the Pólya-Szegö symmetrization principle in the fractional case. As a consequence we determine new results for rearrangement invariant hulls of generalized Besov spaces.     

Completeness of quasi-normed symmetric operator spaces

We show that (generalized) Calkin correspondence between quasi-normed symmetric sequence spaces and symmetrically quasi-normed ideals of compact operators on an infinite-dimensional Hilbert space preserves completeness. We also establish a semifinite version of this result.