基于凸函数的风险测度

利用凸函数构造了一种新的风险测度,发现它是包含了损失概率、损失期望值、绝对离差、绝对半离差,下偏矩、(α,t)模型、ES等常见方法的更为广泛的风险测度.对其性质的研究发现该风险测度满足凸性和协调性,考虑到凸性以及协调性在投资组合以及风险管理中的重要意义,因此对该风险测度的研究就具有一定的实践和学术价值.     

Characterizations of Hermitian varieties by intersection numbers

In this paper, we give characterizations of the classical generalized quadrangles H(3, q ²) and H(4, q ²), embedded in PG(3, q ²) and PG(4, q ²), respectively. The intersection numbers with lines and planes characterize H(3, q ²), and H(4, q ²) is characterized by its intersection numbers with planes and solids. This result is then extended to characterize all Hermitian varieties in dimension at least 4 by their intersection numbers with planes and solids.      

群体决策的随机较多法

对于各决策个体可以作出随机偏爱排序判断的群体决策问题,给出一个群体对所有供选方案进行偏爱排序的随机型较多规则,检验了此规则满足随机偏爱公理的情况,并且进一步研究了它的两个理性性质.     

直觉模糊粗糙集的公理化

直觉模糊粗糙集的公理系统是直觉模糊粗糙集理论与应用的基础,文章定义了直觉模糊集的2种运算,基于这些运算和直觉模糊粗糙集公理化模型,给出直觉模糊粗糙集新的公理系统;该系统用一条简洁的公理描述了直觉模糊粗糙集,为直觉模糊粗糙集理论研究的深入和完善提供了有益的帮助。     

莘数理论(Ⅰ)

本文给出了莘数的定义与性质,从而扩张了经典数系,并对莘数范围内解方程作了初步的准备.     

代数替换公理与对偶原理

提出和阐明了两个普遍的逻辑规律——代数替换公理与对偶原理．通过这两个规律,极大地简化和统一了布尔代数中的运算规律和运算公式．在布尔代数中,A的非与A的对偶本质上是一回事．对偶本质上是一种对称的关系．一个代数表达式(这里的表达式是一个广义的概念,它可以是一个变量,一个常量,一个逻辑函数,一个集合表达式等)的对偶,等于该表达式中的每个元素(如变量、常量、运算符、关系符等,对偶算子除外)分别同时取其对偶,并保持原来的运算次序不变(也即原表达式中的对偶算子和括号位置不变);对于关系表达式而言,原表达式与其对偶表达式必然同时正确或同时错误,这一规律叫做对偶原理．     

Convergence spaces and diagonal conditions

Certain diagonal axioms due to Kowalsky, Cook and Fischer are studied and compared.     

论Hilbert公理体系的解析结构(Ⅱ)——有序仿射几何与无连续公理欧氏几何的解析结构

本文讨论有序仿射几何与有序体上仿射几何之间的联系,以及无连续公理欧氏几何与pythagoras域上欧氏几何之间的联系。     

A Gap Cohomology Group

Dan Talayco has recently defined the gap cohomology group of a tower in p(ω)/fin of height ω₁. This group is isomorphic to the collection of gaps in the tower modulo the equivalence relation given by two gaps being equivalent (cohomologous) if their levelwise symmetric difference is not a gap in the tower, the group operation being levelwise symmetric difference. Talayco showed that the size of this group is always at least 2^N0 and that it attains its greatest possible size, 2^N1, if ? holds and also in some generic extensions in which CH fails, for example on adding many Cohen or random reals. In this paper it is shown that there is always some tower whose gap cohomology group has size 2^N1. It is still open as to whether there are models in which there are towers whose gap cohomology group has size less than 2^ω1.     

O-convergence of fuzzy nets and its applications

In this paper, an O-convergence theory of fuzzy nets is built in L-topological spaces by means of neighborhoods of fuzzy points. It has many nice properties. It can be used to characterize the closed set, open set, T₂ separation axiom and fuzzy compactness.