Banach值鞅变换算子的有界性

本文运用Banach值鞅不等式和鞅空间的相互嵌入关系．讨论了Banach空间值鞅空间上鞅变换算子L的有界性．并给出了鞅变换算子的有界性与Banach空间几何性质的关系．     

Banach空间值鞅上的拟局部算子

本文研究了拟局部算子在几个Banach空间值鞅空间上的有界性.给出了几个有界性定理,证明了鞅空间的简单原子分解.得到几个极大算子和p均方算子的一系列鞅不等式以及鞅空间的包含关系.     

加权Orlicz-Lorentz鞅空间的原子分解及其应用

本文研究加权Orlicz-Lorentz鞅空间的原子分解理论.利用原子分解方法,获得了加权Orlicz-Lorentz鞅空间的内插理论以及鞅变换算子的有界性证明.上述结果推广了Orlicz和Lorentz鞅空间理论相关结果.     

p-拟鞅变换

本文研究了p-拟鞅变换的问题.利用Banach空间的几何性质,得到一维和二维参数下拟鞅变换理论,推广了鞅变换的一些结果.     

鞅空间的原子分解与有限鞅的稠密性

引入了原子鞅与正则原子鞅概念、并研究了两类Banach空间值鞅Hardy空间的原子分解和有限鞅的稠密性,所得结论揭示了鞅Hardy空间正则原子鞅分解的存在性,有限鞅的稠密性和Banach空间的一致光滑性（或一致凸性）三者之间的内在联系．     

弱Orlicz鞅空间的原子分解

本文对于几种类型的弱Orlicz 鞅空间建立了强型和弱型的原子分解定理, 证明了这些空间上的次线性算子的有界性以及这些空间彼此的连续嵌入关系. 弱Orlicz 空间是一类拟Banach 空间, 有关结论扩展了现有的关于Orlicz 空间和弱型Lorentz 空间的相关结论.     

BMO鞅空间上极大算子与均方算子的有界性

本文证明了,q 均方算子在 X 值 BMO 鞅空间上是有界的当且仅当 X 同构于 q凸 Banach 空间。此外给出了极大算子与 q 均方算子的 BMO 范数,讨论了鞅空间(?)_q 与BMO_q 的相互包含关系并以此刻划了 Banach 空间的几何性质。     

鞅不等式与 Banach 空间的凸性和光滑性

我们用 B 值鞅的 P 方函数 S~(p)f 的 a.e.有限性刻划了 Banach 空间的p 一致可凸性质,建立了这种函数的凸Φ函数不等式,讨论了这些不等式成立的条件,鞅变换的性质以及鞅的局部收敛性与 Banach 空间的 q一致凸性和 p一致光滑性的关系,同时给出了超自反空间以及与 Hilbert 空间同构的 Banach空间的特征.     

集值拟鞅和集值一致渐近鞅

本文讨论了集值拟鞅和集值一致渐近鞅,证明了集值拟鞅与集值一致渐近鞅的选样定理,对于集值一致渐近鞅得到了一些收敛性结果,并由此刻化了空间的 Radon-Nikodym性质.     

复空间的凸性与Hardy鞅不等式

本文研究了取值于复拟Banach空间的一种特殊类型的鞅——Hardy鞅的不等式与该空间的解析一致凸性的关系,证明了Hardy鞅的q均方函数的弱(1,1)型,强(p,p)型和凸φ函数的不等式,并应用它们给出了复空间的解析q一致可凸性的等价条件.同时借助于复平面单位圆中的Banach空间值解析函数和Brown运动给出了同样的刻划.     

鞅的矩型极大算子的若干不等式

给出了算子T=∑_(n=1)~∞T_n在H_B~p和BMO_(p,B)~-上有界的一些充分条件,其中T_n(n∈P)为具有Δ性质的算子.作为应用,借助于算子值鞅变换得到了关于鞅的矩型极大算子的强(p,p)型不等式和弱(1,1)型不等式,以及其在BMO_(p,B)~-上的有界性.这些结果与经典H~p鞅论中极大算子的性质相对应.     

A uniform boundedness theorem for locally convex cones

We prove a uniform boundedness theorem for families of linear operators on ordered cones. Using the concept of locally convex cones we introduce the notions of barreled cones and of weak cone-completeness. Our main result, though no straightforward generalization of the classical case, implies the Uniform Boundedness Theorem for Fréchet spaces.

     

Logarithmic Growth for Matrix Martingale Transforms

An example is given of an operator weight W that satisfies thedyadic operator Hunt–Muckenhoupt–Wheeden condition for which there exists a dyadic martingale transform on L² (W) that is unbounded. The constructionrelates weighted boundedness to the boundedness of dyadic vectorHankel operators.     

Mean2-Bounded Operators on Hilbert Space and Weight Sequences of Positive Operators

We introduce and study the class of mean₂-bounded operators on Hilbert space. These operators, which are characterized by a uniform boundedness condition on the 'quadratic averages' of their powers, are intimately related to operator-valued weight sequences and weighted norm inequalities. Mean₂-bounded operators exhibit a lively interplay with the discrete Hilbert transform in an array of settings. Under appropriate circumstances, mean₂-bounded operators have a rich spectral theory leading to powerful transference properties.     

BOUNDEDNESS OF SEVERAL OPERATORS ON MARTINGALE SPACES AND THE GEOMETRY OF BANACH SPACES

The aim of this paper is establishing some inequalities of several operators on Banach-space-valued martingales and using them to give some characterizations of geometrical properties of Banach spaces. In particular, the Φ-function nequalitities of sharp operators f_p~#, f_p~#, p-variation operators W_p, W_p and the martingale tranform operator T_v are discussed. It is proved that the boundedness of these operators characterizes the smoothness, convexity and UMD-property of Banach spaces.     

Uniform convergence of reversed martingales

A necessary and sufficient condition for the uniform convergence of a family of reversed martingales converging to a degenerated limiting process is given. The condition is expressed by means of regular convergence (in Hardy's sense) of corresponding means. It is shown that the given regular convergence is equivalent to Hoffmann-Jørgensen's eventually totally boundedness in the mean which is necessary and sufficient for the uniform law of large numbers. Analogous results are carried out for families of reversed submartingales. By applying derived results several convergence statements are obtained which extend those from the uniform law of large numbers to the general reversed martingale case.     

随机脉冲泛函微分方程的{\boldmath p}阶矩有界性

随机脉冲泛函微分方程是一个具有广泛应用前景的数学模型. 该文利用带Razumikhin条件的Liapunov直接法和比较原理, 得到了随机脉冲泛函微分方程的解的一致(一致且最终、一致且一致最终) p阶矩有界的充分条件, 其中在获得一致有界性和一致最终有界性时, 对dV(t, x(t))/dt 的限制条件也较少, 因此研究结果非常便于应用.