满足Solow条件的矩阵的性质

讨论了满足Solow条件矩阵的几个性质，并给出了与此相关的经济意义。     

随机Solow经济增长模型及其解的性质

１９８７年诺贝尔（Ｎｏｂｅｌ）经济学奖获得者Ｓｏｌｏｗ教授，建立了确定性的经济增长模型（１９５６年）．它比较真实地描述了现实世界申的确定性的经济增长状况，然而对不确定性的现象，往往误差较大，甚至失效．本文把Ｓｏｌｏｗ模型扩展到随机情形，扩展了Ｂａｎａｃｈ压缩映像原理和不动点定理，获得了随机Ｓｏｌｏｗ模型主要方程和随机解的一些性质．     

劳动力供给带弹性的Solow模型

本文给出了在劳动力供给带弹性条件下的Ｓｏ１ｏｗ增长模型，给出了经济增长的黄金律和均衡处资本稳定性的证明，并且与不带弹性的Ｓｏｌｏｗ模型作了比较．     

随机Solow模型的平稳分布（英文）

本文重新考虑连续时间随机Solow模型,在Merton(1975)模型的条件下,若噪声相对较小时,资本及利率的随机微分方程存在唯一全局正解.本文证明这两类模型存在唯一的稳定分布.     

Benson 真有效意义下向量优化的最优性条件

对向量值映射引入了Clarke切导数,A djacent切导数及Contingent导数的概念,讨论了它们的性质,并用其建立了束向量优化有效解在Benson真有效意义下的Fritz John及Kunh-Tucker条件。     

赋权矩阵及其性质

本文给出了以S为行权和向量的权矩阵类T_＋(S)中每个权矩阵都可逆的一个充要条件．     

连续随机Solow模型的渐近性质

本文重新考虑了随机Solow模型,在Merton(1975)模型的条件下, 证明出描述模型的随机微分方程的解为正值,这补充了Merton的结果.利用随机微分方程平凡解的指数不稳定性并结合Merton的结果,得出资本与劳动的比率或者呈现稳定(渐近)分布, 或者呈指数增长.在这些结果中, 劳动力供给与资本积累的波动起着重要作用.     

某些条件极值问题的向量解法

条件极值问题 ,在日常生活中应用极广 ,涉及到的知识面较为广阔 ,解法多样 .对于某些具有圆型或有限和型条件 ,而且目标函数是圆型或有限和型函数的条件极值问题 ,可通过构造恰当的向量 ,利用向量内积不等式获得简便的解法 ,本文将通过几个具体的例子予以介绍 .本文要用关于向量内积的基本不等式 (柯西不等式 ) :若 ｍ =(ｍ1,ｍ2 ,… ,ｍｋ)、 ｎ =(ｎ1,ｎ2 ,… ,ｎｋ)是ｋ维向量 , ｍ·ｎ=∑ｋｉ=1ｍｉｎｉ(称为向量 ｍ与 ｎ的内积 ) ,| ｍ | =∑ｋｉ=1ｍ2 ｉ12 (称为向量 ｍ的模或长度 ) ,则 | ｍ· ｎ|≤ | ｍ |·| ｎ| .上式等…     

“向量极值问题的最优性条件”一文的注记

本文给出了文［１］中的几个主要结果（即［１］中的推论２，定理４，定理６及定理７）的反例，进而更正了有关结果     

关于矩阵奇异值的若干性质

探讨矩阵奇异值的性质及其与范数、谱半径、特征值等矩阵“大小”度量的关系,帮助学生建立这些概念之间的内在联系,强化对相关概念的理解和掌握.     

Extensions from the Sobolev Spaces H 1 Satisfying Prescribed Dirichlet Boundary Conditions

Extensions from H ¹(_P) into H ¹() (where _P ) are constructed in such a way that extended functions satisfy prescribed boundary conditions on the boundary of . The corresponding extension operator is linear and bounded.     

亚正定阵的两个充分条件及应用

建立了亚正定阵的两个充分条件,并给出它们在投入产出和控制理论中的一些应用.     

The Singularity/Nonsingularity Problem for Matrices Satisfying Diagonal Dominance Conditions in Terms of Directed Graphs

The paper considers the singularity/nonsingularity problem for matrices satisfying certain conditions of diagonal dominance. The conditions considered extend the classical diagonal dominance conditions and involve the directed graph of the matrix in question. Furthermore, in the case of the so-called mixed diagonal dominance, the corresponding conditions are allowed to involve both row and column sums for an arbitrary finite set of matrices diagonally conjugated to the original matrix. Conditions sufficient for the nonsingularity of quasi-irreducible matrices strictly diagonally dominant in certain senses are established, as well as necessary and sufficient conditions of singularity/nonsingularity for weakly diagonally dominant matrices in the irreducible case. The results obtained are used to describe inclusion regions for eigenvalues of arbitrary matrices. In particular, a direct extension of the Gerschgorin (r = 1) and Ostrowski-Brauer (r = 2) theorems to r ≥ 3 is presented. Bibliography: 18 titles. __________ Translated from Zapiski Nauchnykh Seminarov POMI, Vol. 309, 2004, pp. 40–83.     

Integrable Systems and Rank-One Conditions for Rectangular Matrices

We give a determinantal formula for tau functions of the KP hierarchy in terms of rectangular constant matrices A, B, and C satisfying a rank-one condition. This result is shown to generalize and unify many previous results of different authors on constructions of tau functions for differential and difference integrable systems from square matrices satisfying rank-one conditions. In particular, its explicit special cases include Wilson's formula for tau functions of the rational KP solutions in terms of Calogero–Moser Lax matrices and our previous formula for the KP tau functions in terms of almost-intertwining matrices.     

行半正定矩阵的充要条件及其性质

文章给出行半正定矩阵的概念,并对它进行讨论,获得行半正定矩阵的一些充要条件及其性质。     

Quasi-Metrizable Spaces Satisfying Certain Completeness Conditions

It is shown that a quasi-metrizable space possesses a -base if and only if it admits a left -complete quasi-metric and that a quasi-metrizable Moore space possesses a -base if and only if it admits a Smyth complete quasi-metric. Furthermore those quasi-metrizable Moore spaces are characterized that admit a right -complete (equivalently, bicomplete) quasi-metric. Finally, it is established that a topological space admits a Smyth complete quasi-uniformity if and only if it is quasi-sober.     

On Bernstein Algebras Satisfying Chain Conditions

Our aim in this article is to study Noetherian and Artinian Bernstein algebras. We show that for Bernstein algebras which are either Jordan or nuclear, each of the Noetherian and Artinian conditions implies finite dimensionality. This result fails for general Noetherian or Artinian Bernstein algebras. We also investigate the relationships between the three finiteness conditions: Noetherian, Artinian, and finitely generated. Especially, we prove that Noetherian Bernstein algebras are finitely generated.     

通解矩阵(英文)

用消元法程序在计算机上求含ｍ个方程ｎ个未知量的线性代数方程组的通解的问题现在仍然没有得到解决．本文首先给出一个称为“通解矩阵”的新定义，然后证明两个有关定理．以此为基础，使解决上述问题成为一件容易的事．