（h，φ）-广义单调与（h，φ）-广义凸

本文定义了几种（h，φ）-广义凸性及（h，φ）-广义单调性，讨论了广义（h，φ）-方向导数与Clarke方向导数，广义（h，φ）-梯度集与Clarke梯度集等的相关关系．利用此关系证明了这些广义凸性与广义单调性之间的相关关系，同时还揭示了这些广义凸性、单调性与通常广义凸性、单调性存在的内在联系．     

均匀性度量的势函数模型

分析了均匀性度量应满足的基本条件，根据物理学的势和力的模型，提出了均匀性度量的势函数模型，该模型较好地解决了均匀性度量的可计算性、布点的均匀性调整方法等问题；而且具有均匀性度量所应该具有的所有优良性质，如旋转对称性、平移对称性、中心对称性等。最后给出了应用实例，并就低维投影的均匀性问题和势函数模型的改进作了讨论。      

二十一世纪珠算发展的构思

光阴荏冉，世事沧桑，客观真理，恒久不变，这就决定了事物的绵延性、连续性、恒久性。     

有向图对策下的Banzhaf值及其应用

Banzhaf值是经典可转移效用合作对策中重要的分配规则之一，它假设任何有限参与者间均能进行合作形成可行联盟。2006年，Alonso-Meijide和Fiestras-Janeiro考虑无向网络，定义了图对策下的Banzhaf值，以此反映合作网络对参与者间合作以及分配结果的影响。本文则在此基础上，考虑合作网络的方向性，将Banzhaf值进一步推广到有向图对策中，提出了新的分配规则——有向Banzhaf值。首先，本文证明了有向Banzhaf值满足准隔离性、收缩性、公平性、强分支可分解性以及强分支总贡献性。其次，证明了有向Banzhaf值可由公平性、准隔离性以及收缩性唯一刻画，也可由公平性结合强分支总贡献性唯一刻画。最后，以湿地水循环系统为例，对有向Banzhaf值和其他值进行了比较分析，讨论了有向Banzhaf值的应用价值。     

Hardy空间Hp(BN)上的加权复合算子

φ：BN→BN的全纯映射，ψ∈H（BN），其中H（BN）表示BN上全纯函数集合，定义加权复合算子Wφ，ψf=ψ（f φ），f∈H（BN）．本文研究了Hardy空间H^p（BN）上的加权复合算子的有界性、紧性、弱紧性以及完全连续性，给出了有界性、紧性的充要条件以及证明了紧性与弱紧性的等价关系．最后讨论了加权复合算子的完全连续性．     

系统L^＊中极大相容理论的结构刻画和紧致性定理

为给模糊推理建立严格的逻辑基础，本文第二作者在1997年提出了一种新型的模糊命题演绎系统L^＊。本文基于系统L^＊的强完备性定理给出了极大相容理论的结构刻画，证明了每一个极大相容理论必然具有形式D（{φ1，φ2，…}），这里φ1∈{pi，→pi，（→pi^2）＆（→（→pi）^2）}（i=1，2，…），p1，p2，…是系统L^＊中全体命题变元，进而给出了极大相容理论的若干刻画条件。本文还证明了系统L^＊的满足性定理和紧致性定理。至此，系统L^＊的基本定理包括完备性定理、强完备性定理、可判定性定理、满足性定理和紧致性定理已被我们所掌握，所以本文的结果完善了系统L^＊的理论体系。     

关于可数个空间的箱拓扑

讨论了可数个空间的箱拓扑为紧性，序列式紧性，第二可数性，第一可数性，分性及连通性的条件。     

周期解的存在性、唯一性与稳定性

本文研究了高维周期系统的周期解的存在性、唯一性及稳定性等问题，利用指数型二分性和不动点方法，建立了保证周期解的存在性、唯一性及稳定性的充分条件，所得的结果推广了文［１、２］的主要结果。     

一类非线性生化系统的定性分析

研究了一类非线性生化系统的定性行为，给出了该系统极限环的不存在性、存在性、惟一性和稳定性的充分条件，补充和完善了戴林勋(1999)的结论。     

三角形的等腰性系数及其推广

我们把一个三角形的所有边长之比的最接近于1的那个比值称为这个三角形的等腰性系数．这是衡量该三角形与等腰性相差多远的一个数值．1991年莫斯科独立大学第一期人学试题的最后一道试题问：三角形的等腰性系数可以取什么值？在本文里，我们先证明如下的结论．定理1设bADC的等腰性系数为人，则＿，＿、，JS一l、，可得AE（，1」．证明明显地，等腰三角形的等腰性系数为1．一般地，设三角形的三边长为a、b和C、。。－，一、。。c、be一、a－a满足a＜b＜c，这样车＞号、十＞l，子＜子、I，。。、v、“’“’”d”d”b”“’”b”b＿、＿，…     

Some Mixed Problems for Semilinear Parabolic type Equation

In this paper, some mixed problem with third type boundary value for a semilinear parabolic equation is investigated. Here the solvability theorems for considered problem and the uniqueness theorem for a model case of the problem are showed.     

一个扩散问题的自然边界元法与有限元法组合

本文讨论由Helmholtz方程描述的扩散问题的自然边界元法与有限元法的组合．取一个圆作为公共边界，用Fourier展开建立边界积分方程，将无界区域上的问题化为有界区域上的非局部边值问题．在变分方程中公共边界上的未知量只包含函数本身而不包含其法向导数，从而减少了未知数的数目，并且边界元剐度矩阵只有极少量不同的元素，有利于数值计算．这种组台方法优越于建立在直接边界元法基础上的组合方法．文中证明了变分解的唯一性，数值解的收敛性和误差估计．最后讨论了数值技术并给出一个算倒．     

Uniqueness of Quasi-Regular Solutions for a Bi-Parabolic Elliptic Bi-Hyperbolic Tricomi Problem

The Tricomi equation $ yu_{xx} + u_{yy} = 0 $ was established in 1923 by Tricomi who is the pioneer of parabolic elliptic and hyperbolic boundary value problems and related problems of variable type. In 1945 Frankl established a generalization of these problems for the well-known Chaplygin equation $ K(\,y)u_{xx} + u_{yy} = 0 $ subject to the Frankl condition 1 + 2( K / K ')' > 0, y <0. In 1953 and 1955 Protter generalized these problems even further by improving the above Frankl condition. In 1977 we generalized these results in R n ( n > 2). In 1986 Kracht and Kreyszig discussed the Tricomi equation and transition problems. In 1993 Semerdjieva considered the hyperbolic equation $ K_1 (\,y)u_{xx} + (K_2 {\rm (\,}y{\rm )}u_y )_y + ru = f $ for y<0. In this paper we establish uniqueness of quasi-regular solutions for the Tricomi problem concerning the more general mixed type partial differential equation $ K_1 (\,y)(M_2 {\rm (}x{\rm )}u_x )_x + M_1 (x)(K_2 {\rm (\,}y{\rm )}u_y )_y + ru = f $ which is parabolic on both lines x = 0; y = 0, elliptic in the first quadrant x > 0, y > 0 and hyperbolic in both quadrants x< 0, y > 0; x > 0, y< 0. In 1999 we proved existence of weak solutions for a particular Tricomi problem. These results are interesting in fluid mechanics.     

On the Invertible Boundary Integral Operator in the Exterior Impedance Problem for the Helmholtz Equation

We propose an approach for reduction of the impedance problem for propagative Helmholtz equation outside several obstacles to the uniquely solvable Fredholm integral equation of the second kind and index zero. The integral equation in this approach is derived by introducing auxiliary boundaries with an appropriate boundary conditions inside obstacles.     

A Class of Quadratic Integral-Differential Equations

A nonlinear integro-ordinary differential equation built up by a linear ordinary differential operator of n th order with constant coefficients and a quadratic integral term is dealt with. The integral term represents the so-called autocorrelation of the unknown function. Applying the Fourier cosine transformation, the integral-differential equation is reduced to a quadratic boundary value problem for the complex Fourier transform of the solution in the upper half-plane. This problem in turn is reduced to a linear boundary value problem which can be solved in closed form. There are infinitely many solutions of the integral-differential equation depending on the prescribed zeros of a function related to the complex Fourier transform.     

ALTERNATING BAND CRANK-NICOLSON METHOD FOR

The Alternating Segment Crank-Nicolson scheme for one-dimensional diffusion equation has been developed in [ 1 ], and the Alternating Block Crank-Nicolson method for two-dimensional problem in [2]. The methods have the advantages of parallel computing, stability and good accuracy. Tn this paper for the two-dimensional diffusion equation, the net region is divided into bands, a special kind of block. This method is called the alternating Band Crank-Nicolson method.     

Probabilistic Solutions to Optimal Control Problems

Let ( x 1 ( t ), x 2 ( t )) be a controlled two-dimensional diffusion process. The problem of minimizing, or maximizing, the time spent by ( x 1 ( t ), x 2 ( t )) in a given subset of 2 is solved, in two particular instances, by transforming the optimal control problems into purely probabilistic problems. In Section 2 , ( x 1 ( t ), x 2 ( t )) is a two-dimensional Wiener process and the optimal control is obtained by transforming a nonlinear dynamic programming equation into the Kolmogorov backward equation for a two-dimensional geometric Brownian motion. In Section 3 , the converse problem is solved. The problem of finding the maximal instantaneous reward that we can give for survival in the continuation region is also treated.     

Newton方程周期解存在唯一性的新证明

本文首先将Newton方程周期边值问题转化为初值问题，然后在较弱的条件下利用微分连续法构造性地证明了该方程周期解的存在唯一性．证明方法同时也提供了一种计算该周期解的大范围收敛方法．     

Fuzzy矩阵方程的摄动问题

讨论了Fuzzy矩阵A的同解简化矩阵A^(2)，指出陈贻源论文《解Fuzzy关系方程》中定量3的错误。研究Fuzzy矩阵方程的摄动问题，解决了汤服成（2000）提出的未解决问题。     

On the Second-order Equations of Mixed Type of First Kind

In this paper the generalized Tricomi problem for the second-order equation of mixed type of first kind is considered. The uniqueness or solutions is proved under very weak conditions oil the coefficients or equation and the boundary curve of domain. The existence of H¹ strong solutions is proved for the Tricomi problem.