单调线性互补问题的最小原则(II)

在文［１］的基础上，对单调线性互补问题（ＭＬＣＰ）给出了不同于文［１７］的最小原则的另一形式，并提出了一个在有限步内求出单调线性互补问题解集的新算法；给出了单调线性互补问题的三个误差界公式．这些公式推广了文［６］的有关结果，并且较文［８］中的误差界表示形式简洁和易于检验．     

求反三角函数值方法的再改进

形如ａｒｃｓｉｎ（ｓｉｎｘ）（ｘ∈Ｒ）的一类式子的求值问题已有一些文章提到了它们的重要性，并讨论了解答这些问题的公式和方法，如文［１］就给出了八个公式．但正如文［２］指出的那样，文［１］给出的八个公式太繁琐，不容易付诸教学和应用．文［２］也给出了改进...     

借助单调区间求解

借助单调区间求解甘肃省武威六中赵多彪文［１］讨论了含参数的对数方程的解法，文［２］对含参数问题的各种解法进行了多方位的探讨，文［３］则对文［１］中的解法进行了改进．本文不揣浅陋，根据教学中的一些体会，对含参数方程有几个解的问题抛开分类讨论的思维定势提...     

几类特殊测地块的构造(英)

本文给出了一种构造给定直径d和围长g的测地块的方法．它是文［1］中构造法的推广，解决了文［1］中待研究的几个问题．同时，对文［1］中的一个错误进行了修正．     

多裂纹圆柱弯曲问题的奇异积分

本文在文［１］的基础上，利用文［２］给出的无裂纹柱体弯曲问题的通解，求得了多裂纹圆柱横力弯曲应力函数及横截面剪应力的奇异积分表达式。本文方法借助数值积分表达式￣［３］，极易在微机上实现，可以完全类似文［１］所做的那样进行数值计算．     

关于多复变数Cauchy型积分的边界性质

本文用新的方法研究Ｂ－Ｍ型积分的边界性质，所得结果推进了文［１］的结果，并指出文［４］证明有错误     

关于图的（g，f）－因子分解的一些新结果

本文讨论图的（ｇ，ｆ）－因子分解问题，推广了文［１］关于图的因子分解的理论，改进了文［２］的一些结果，给出了一个图Ｇ是（ｇ，ｆ）－可因子化的若干充分条件．     

有约束错误指定模型下的优化问题

文［１］ 利用文［3］的结果证明了一般有约束线性模型下参数的最优估计的方差协方差阵与有约束错误指定模型下最优估计的方差协方差阵间差是非负定的充分条件［２］也是必要的。更进一步，文［4］将［1］中的定理1推广到奇异线性模型上。该文的主要目的是证明了［２］的猜想在奇异线性模型中也是正确的，同时，推广了［１］中的定理2。     

三连贯二次多项式的完善

三连贯二次多项式的完善李世杰（浙江衢州市教研室３２４０００）《数学通讯》１９９５年第２期，杨仕椿老师在文［１］中解决了二次多项式有整根时的三连贯问题．《数学通讯》１９９５年第８期，余熙国老师在文［２］中对文［１］的结论作了补充．但文［２］中的定理２，...     

维数不同的相关量之间的微积分关系释疑

维数不同的相关量之间的微积分关系释疑王金贵（北京电力高等专科学校１０００４４）本刊１９９６年第１期问题讨论专栏文［２］对本刊１９９５年第６期文［１］的结论提出了疑义，疑点出在对结论的条件的理解上，作为文［１］的作者，也谈谈对文［１］结论的条件的理解，...     

Zariski density in lie groups

In [7] Furstenberg gave a proof of Borel’s density theorem [1], which depended not on complete reducibility but rather on properties of the action of a minimally almost periodic group on projective space. In [9] and [10] the basic idea of this proof was extended in various ways to deal with other particular classes of Lie groupsG and closed subgroupsH of cofinite volume. In [5] Dani gives a more general form of the density theorem in whichH need only be non-wandering. In the present paper we define the condition ofk-minimal quasiboundedness, and prove that this condition is necessary and sufficient for the density theorem to hold ((2.4) and (2.6)). Here we replace the arguments of [9] and [10] simply by proofs that the groups considered there satisfy this condition (2.10). We extend the results of [9] and [10] by considering groups which are analytic rather than algebraic, and in the solvable case we completely characterize thek-minimally quasibounded groups (2.9). In the last section we give two applications of the density theorem.     

Some algebraic properties of the hyperbolic systems

Abstract The technique of quasi-symmetrizer has been applied to the well-posedness of the Cauchy problem for scalar operators [10], [13] and linear systems [5], [15], [4], and to the propagation of analitycity for solutions to semi-linear systems [6]. In all these works, it is assumed that the principal symbol depends only on the time variable. In this note we illustrate, in some special cases, a new property of the quasisymmetrizer which allows us to generalize the result in [6] to semi-linear systems with coefficients depending also on the space variables [21]. Such a property is closely connected with some interesting inequalities on the eigenvalues of a hyperbolic matrix. We expect that this technique applies also to other problems. Keywords: First order hyperbolic systems, Quasi-symmetrizer, Glaeser inequality     

The Algebraic Perturbation Method for Generalized Inverses

Algebraic perturbation methods were first proposed for the solution of nonsingular linear systems by R. E. Lynch and T. J. Aird [2]. Since then, the algebraic perturbation methods for generalized inverses have been discussed by many scholars [3]-[6]. In [4], a singular square matrix was perturbed algebraically to obtain a nonsingular matrix, resulting in the algebraic perturbation method for the Moore-Penrose generalized inverse. In [5], some results on the relations between nonsingular perturbations and generalized inverses of $m\times n$ matrices were obtained, which generalized the results in [4]. For the Drazin generalized inverse, the author has derived an algebraic perturbation method in [6]. In this paper, we will discuss the algebraic perturbation method for generalized inverses with prescribed range and null space, which generalizes the results in [5] and [6]. We remark that the algebraic perturbation methods for generalized inverses are quite useful. The applications can be found in [5] and [8]. In this paper, we use the same terms and notations as in [1].     

概率度量空间与映象的不动点定理

概率度量空间的概念首先由Menger[7]提出,以后许多人对这一空间的理论和应用曾进行过某些讨论(见[1-9])。本文的目的是进一步研究这一空间中映象的不动点定理。在本文的§2中,我们得出了一些新型的不动点定理,这些结果改进和加强了引文[2,3,8]中某些主要结果。     

Two Theorems on Volume and Dihedral Angles of a n—dimensional Simplex

In this paper,we obtain thorem 1 on volum of a n-dimensional simplex and theorem 2 on dihedral angles of a simplex.Besides.We obtain Vasic inequality in E^n and its extension.The results in this paper contain and improve the results in paper[1]、[2]、[3]、[4].     

Quasi-Monte Carlo methods for the numerical integration of multivariate walsh series

In [1], a method for the numerical integration of multivariate Walsh series, based on low-discrepancy point sets, was developed. In the present paper, we improve and generalize error estimates given in [1] and disprove a conjecture stated in [1,2].     

关于M—矩阵等价表征的注记

「２」指出了「１」的某些错误,并给出了修正的结果。本继续「２」的讨论,给出了Ｍ－矩阵等价表征的进一步结果。     

One-sided derivatives for the value function in convex parametric programming

In [9] it is shown that the one-sided derivatives of parametric linear semi-infinite programs can be expressed in terms of one-sided cluster points of solutions and Lagrange-multipliers of the perturbed problem.

In this paper convex programs on Banach-spaces are studied. We generalize the results in [9] to this case. The analysis is based on convex duality theory [2].     

一类完备Riemann流形的正调和函数

本文主要讨论一类完备Ｒｉｅｍａｎｎ流形上的调和函数所组成的线性空间．推广了Ｐ．Ｌｉ及Ｌ．Ｆ．Ｔａｍ^{[5], [7]}和和Ｇｒｅｅｎｅ－Ｗｕ^[3]中的结果．     

On some riesz bases

In this paper we consider three problems concerning systems of vector exponentials. In the first part we prove a conjecture of V. Komornik raised in [14] on the independence of the movement of a rectangular membrane in different points. It was independently proved by M. Horváth [9] and S. A. Avdonin (personal communication). The analogous problem for the circular membrane was partly solved in [3] — the complete solution is given in [10]. In the second part we fill in a gap in the theory of Blaschke-Potapov products developed in the paper [19] of Potapov. Namely we prove that the Blaschke-Potapov product is determined by its kernel sets up to a multiplicative constant matrix. In the third part of the present paper we give a multidimensional generalization of the notion of sine type function developed by Levin [16], [17] and by our generalization we prove the multidimensional variant of the Levin-Golovin basis theorem [16], [6].