Now showing items 866-885 of 2622

    • (m,/)秩幂等矩阵和(m,/)幂等矩阵的特性研究 

      郭文静; 杨忠鹏; 陈梅香 (2009)
      如果存在自然数M,l(M>l)使r(A--M)=r(A--l),称A为(M,l)秩幂等矩阵;当A--M=A--l时,称A为(M,l)幂等矩阵.依据矩阵的幂等性与秩幂等性不随数域的改变而改变这一基本事实,应用JOrdAn标准形的性质,得到了这两类既有区别又有密切联系的矩阵类的特性刻画.
    • (m,l)秩幂等矩阵和(m,l)幂等矩阵的特性研究 

      郭文静; 杨忠鹏; 陈梅香 (《北华大学学报(自然科学版)》编辑部, 2009-02)
    • (m,q)阶序列分数差分方程的解 

      程金发 (2014-11-28)
      通过构造一个特殊函数λα(n),揭示该函数的重要性质;利用特殊函数λα(n),得到线性常系数齐次(M,Q)阶序列分数差分方程的特征方程.然后利用有理(M,Q)阶算子分解法,结合z变换方法求出齐次(M,Q)阶序列分数差分方程的显示解;以及结合利用分数grEEn函数求出解非齐次(M,Q)阶序列分数差分方程,得到了一般线性常系数非齐次(M,Q)阶序列分数差分方程解的通解结构和基本定理.
    • Maps preserving products XY-YX* on von Neumann algebras 

      Bai, Zhaofang; Du, Shuanping; 杜拴平 (J MATH ANAL APPL, 2012-02-01)
      Let M, N be von Neumann algebras with no central summands of type I-1. For T, S is an element of M. define [T, S]* = TS - ST* a new product of T and S. In this note, it is proved that a not necessarily linear bijective map ...
    • MAPS PRESERVING UNITARY SIMILARITY ON B(H) 

      Du, Shuanping; Hou, Jinchuan; Bai, Zhaofang; 杜拴平 (ROCKY MT J MATH, 2011)
      Let H be an infinite dimensional complex Hilbert space and denote B(H) the Banach algebra of all bounded linear operators acting on H. It is proved that a surjective map Phi on B(H) satisfying that, for any T, S, R is an ...
    • Markov 链平稳分布的迭代解法 

      郭广报 (厦门大学学报(自然科学版), 2008-05)
      近来,Marek 等第一次将Schwarz 方法引入了奇异线性方程组的求解问题. 然而,这种方法对于分裂阵和迭代阵 的要求过于严格. 本文在此基础上,利用Drazin 逆给出了拟非负分裂的定义. 对Markov 链分裂阵的要求由非负型分裂 推广到拟非负型分裂,证明了Markov 链加性Schwarz 迭代,诱导分离及其粗网格校正的半收敛性,扩充了Schwarz 迭代 方法的理论,使这种方法更具实用性.
    • Markov 链的乘性Schwarz 迭代 

      郭广报; 林建华; 林建华 (厦门大学学报(自然科学版), 2009-01)
      近来,Marek 等将Schwarz 方法引入了奇异线性方程组的求解问题. 然而,这种方法对于分裂阵和迭代阵的要求 过于严格. 本文在此基础上,利用Drazin 逆给出了拟非负分裂的定义. 对Markov 链分裂阵的要求由非负型分裂推广到 拟非负型分裂,研究了Markov 链乘性Schwarz 迭代的半收敛性,两水平乘性Schwarz 迭代的半收敛性和它们的单调性, 扩充了Schwarz 迭代方法的理论,使这种方法更具实用性.
    • Markov链平稳分布的迭代解法 

      郭广报 (2008-05-15)
      近来,Marek等第一次将Schwarz方法引入了奇异线性方程组的求解问题.然而,这种方法对于分裂阵和迭代阵的要求过于严格.本文在此基础上,利用Drazin逆给出了拟非负分裂的定义.对Markov链分裂阵的要求由非负型分裂推广到拟非负型分裂,证明了Markov链加性Schwarz迭代,诱导分离及其粗网格校正的半收敛性,扩充了Schwarz迭代方法的理论,使这种方法更具实用性.
    • Markov链的乘性Schwarz迭代 

      郭广报; 林建华 (2009)
      近来,MArEk等将SCHWArz方法引入了奇异线性方程组的求解问题.然而,这种方法对于分裂阵和迭代阵的要求过于严格.本文在此基础上,利用drAzIn逆给出了拟非负分裂的定义.对MArkOV链分裂阵的要求由非负型分裂推广到拟非负型分裂,研究了MArkOV链乘性SCHWArz迭代的半收敛性,两水平乘性SCHWArz迭代的半收敛性和它们的单调性,扩充了SCHWArz迭代方法的理论,使这种方法更具实用性.
    • Markowitz投资组合模型的优化研究 

      黄斐 (2008-10-05)
      由于Markowitz投资组合模型过于严格的假设,它在中国证券市场的应用上存在一定的局限性。本文在Markowitz均值—方差模型的基础上,对模型中不符合中国证券市场的理想化假设进行修正,通过对预期收益率和风险进行优化度量,将交易费用、最小交易数量等限制条件引入模型,实现了对均值—方差模型的优化,得到了在不同优化背景下的新的数学模型。
    • Matching polynomials for chains of cycles 

      Bian, H; Zhang, FJ; Wang, GP; Yu, HZ; 张福基 (2011-02-28)
      Doslic and Maloy (2010) [2] obtained the extremal 6-cactus chains with respect to the number of matchings and of independent sets. Motivated by the prior paper, in this paper we give recurrences for matching polynomials ...
    • Mathematical basis of idea that harmonious marriage can lengthen life-span 

      Zhang,ZQ; 张志强 (2009-04)
      It is a very important issue for us to explore the effects of the marriage to life. In recent years, many scholars have proved that the marriage can lengthen life-span from different angles. With the development of theory ...
    • {Mathematical expression}-labeling and integer tension of a graph embedded on torus 

      Zhang, Xiaoling L.; Qian, Jianguo G.; 钱建国 (Springer Science+Business Media New York., 2014)
      The {Mathematical expression}-labeling arises from the optimization problem of channel assignment in communication networks. For two non-negative integers {Mathematical expression} and {Mathematical expression}, an ...
    • MATHEMATICAL PROPERTIES AND STRUCTURES OF SETS OF SEXTET PATTERNS OF GENERALIZED POLYHEXES 

      Guo, X. F.; Zhang, F. J.; 郭晓峰 (1992)
      Several definitions of sextet patterns and super sextets of (generalized) polyhexes have been given, first by He Wenjie and He Wenchen [1], later by Zhang Fuji and Guo Xiaofeng [2], and by Ohkami [3], respectively. The ...
    • Matrix decomposition algorithms for the C(0)-quadratic finite element Galerkin method 

      Du, Kui; Fairweather, Graeme; Nguyen, Que N.; Sun, Weiwei; 杜魁 (2009)
      Explicit expressions for the eigensystems of one-dimensional finite element Galerkin (FEG) matrices based on C-0 piecewise quadratic polynomials are determined. These eigensystems are then used in the formulation of fast ...
    • Maximal Operators and Singular Integrals with Non-Isotropic Dilation on Product Domains 

      Ma,BL; Wu,HX; Li,ZK; 伍火熊 (2010-10)
      In this paper, the authors study the L(p)-mapping properties of certain maximal operators with non-isotropic dilation on product domains. As an application, the L(p)-boundedness of the corresponding non-isotropic multiple ...
    • Maximum inverse positive matrices 

      Lu, L. Z.; Ng, M. K.; 卢琳璋 (2007-01)
      We consider a class of inverse positive matrices, which is called Maximum inverse positive (MIP) matrices. If A is an MIP matrix, then for any matrix B which has at least one entry larger than that of A, then B is no tonger ...
    • Maximum principle in linear finite element approximations of anisotropic diffusion-convection-reaction problems 

      Lu, Changna; Huang, Weizhang; Qiu, Jianxian; 邱建贤 (SPRINGER, 2014 JUL)
      A mesh condition is developed for linear finite element approximations of anisotropic diffusion-convection-reaction problems to satisfy a discrete maximum principle. Loosely speaking, the condition requires that the mesh ...
    • Maximum Randic index on trees with k-pendant vertices 

      Zhang, L. Z.; Lu, M.; Tian, F.; 张莲珠 (2007-02)
      The Randic index of an organic molecule whose molecular graph is G is the sum of the weights (d(u) d(v))(-1/2) of all edges uv of G, where d(u) and d(v) are the degrees of the vertices u and v in G. Let T be a tree with n ...
    • Measure theory of statistical convergence 

      Cheng, L. X.; Lin, G. C.; Lan, Y. Y.; Liu, H.; 程立新 (2008-12)
      The question of establishing measure theory for statistical convergence has been moving closer to center stage, since a kind of reasonable theory is not only fundamental for unifying various kinds of statistical convergence, ...