任意随机变量序列的一个强极限定理

研究任意随机变量序列的强收敛性.利用鞅差序列级数收敛定理,证明了任意随机序列的一个强极限定理,作为推论,得到了马氏过程、鞅差序列及独立随机变量序列的强大数定律.     

广义极限鞅的一个收敛定理

本文引进了广义极限鞅的概念,证明了 L~1有界的广义极限鞅 a.s.收敛于—可积随机变量。这样推广了通常极限鞅的相应收敛定理,并回答了 Stout 提出的问题:L~1有界的弱鞅在一定的条件下是 a.s.收敛的。     

A generalization of the Burkholder–Davis–Gundy inequalities

In this paper, by applying some improved inequalities, we extend the Burkholder–Davis–Gundy inequalities for α ∈ (0,1) to more general functions and submartingales. Moreover, a series of inequalities for a logarithmic function are also obtained correspondingly. Finally, we give an application to a stopped Brownian motion.     

BOUNDEDNESS OF DYADIC DERIVATIVE AND CES(A)RO MEAN OPERATOR ON SOME B-VALUED MARTINGALE SPACES

In this article, it is proved that the maximal operator of one-dimensional dyadic derivative of dyadic integral I* and Cesàro mean operator σ* are bounded from the B-valued martingale Hardy spaces pΣα, Dα, pLα, p H#α, pKr to Lα (0 < α < ∞), respectively. The facts show that it depends on the geometrical properties of the Banach space.     

任意随机组列的强极限定理

本文研究了任意随机组列的极限性质.利用构造鞅的方法得到了任意随机组列的强极限定理,所得结果摊广了任意随机适应序列和树上非齐次马氏链的强极限定理.     

关于布朗运动的一个注记

本文对布朗运动的一个充要条件给出另一种证明     

带干扰的一类相依风险模型

本文将古典风险模型推广为带干扰的一类相依风险模型。在此风险模型中,保单到达过程为一Pois-son过程,而索赔到达过程为保单到达过程的P-稀疏过程。利用鞅的方法得到了破产概率和Lundberg不等式。     

特殊半鞅的一个局部性质

本文讨论特殊半鞅的一个局部性质,将局部（平方可积）鞅的结果推广到了一类特殊半鞅的情形。     

Little's theorem: A stochastic integral approach

In a previous paper we have given a unified approach to the PASTA and the conditional PASTA property that is based upon the observation that the difference between the two limits can be represented as a stochastic integral with respect to a square integrable martingale. The equality of the two limits is then a consequence of a strong law of large numbers for martingales. In this paper we derive a non-standard version of Little's theorem via the same method. The moral of the story is that each of these theorems is but a particular case of a more general theory.     

一种新型单点水平期权的定价

本文给出了一种新型单点水平期权,通过鞅定价方法并借助极值的概率分布研究其定价问题,得到了该新型单点水平看涨期权与看跌期权的定价公式.     

A Review of White Noise Analysis from a Probabilistic Standpoint

The main notions and tools from white noise analysis are set up on the basis of the calculus of Gaussian random variables and the S -transform. A new proof of the formula for the S -transform of Itô integrals is given. Moreover, measurability and the martingale property with respect to the Brownian filtration are characterized in terms of the S-transform. This allows the extension of these notions to random variables and processes, respectively, in the space of Hida distributions.     

A martingale approach to scan statistics

Scan statistics are commonly used in biology, medicine, engineering and other fields where interest is in the probability of observing clusters of events in a window at an unknown location. Due to the dependent nature of the number of events in a large number of overlapping window locations, even approximate solutions for the simplest scan statistics may require elaborate calculations. We propose a new martingale method which allows one to approximate the distribution for a wide variety of scan statistics, including some for which analytical results are computationally infeasible.     

复测度鞅变换的收敛性及其应用

在满足ｂ_∞~（Ｋ）∩ａ_１（Ｋ）条件的情况下,讨论了关于复测度ｄμ＝ωｄν的鞅变换,证明了复测度鞅变换的几乎处处收敛性定理。并且,作为该定理的一个应用,对复测度鞅的点态收敛性作了较精细的讨论。     

一类小指标鞅空间的原子分解及其应用

对小指标鞅空间：Ｌｒ（０〈ｐ≤２）建立了原子分解定理。利用原子分解对一些鞅不等式给出了新的简单证明。     

关于可违约债券的一个简化型模型

在Cathcart and E1—Jahel（1998）的Signaling方法的基础上，本文发展了一个具有市场信号变量δt以及随机回收率f（δt）的可违约债券定价的连续时间简化型模型，并用鞅测度的方法给出了近似求解公式．     

Arbitrage and approximate arbitrage: the fundamental theorem of asset pricing

We consider an incomplete market model where asset prices are modelled by Ito processes, and derive the first fundamental theorem of asset pricing using standard stochastic calculus techniques. This contrasts with the sophisticated functional analytic theorems required in the comprehensive works of F. Delbaen and W. Schachermayer (1993) No Arbitrage and the Fundamental Theorem of Asset Pricing, pp. 37–38; Math. Finance 4 (1994), pp. 343–348; Math. Ann. 300 (1994), pp. 464–520; Ann. Appl. Probab. 5 (1995), pp. 926–645 and Proc. Sympos. Appl. Math. 57 (1999), pp. 49–58, and the comparative lack of transparency of the associated technical conditions. An additional benefit is that a clear relationship between no arbitrage and the existence of equivalent local martingale measures is also presented.     

A complete representation theorem for G-martingales

In this article, we establish a complete representation theorem for G-martingales. Unlike the existing results in the literature, we provide the existence and uniqueness of the second-order term, which corresponds to the second-order derivative in Markovian case. The main ingredient of the article is a new norm for that second-order term, which is based on an operator introduced by Song.     

A martingale characterization of the set-indexed Brownian motion

We characterize a Brownian motion indexed by a semilattice of sets, using the theory of set-indexed martingales: a square integrable continuous set-indexed strong martingale is a Brownian motion if and only if its compensator is deterministic and continuous.Research supported by a grant from the Natural Sciences and Engineering Research Council of Canada.Research done while this author was visiting the University of Ottawa. He wishes to thank Professor Ivanoff for her kind hospitality.     

带干扰的多险种风险模型的破产概率

将多险种风险模型推广到带干扰项的一种新模型,讨论了收益过程的性质,并利用鞅的方法得出了破产概率所满足的Lundberg不等式及其一般公式.