Studying Non-negative Factorizations with Tools from Linear Algebra over a Semiring

We develop the technique useful for studying the problem of factoring nonnegative matrices. We illustrate our method, based on the tools from linear algebra over a semiring, by applying it to studying the problem of existence of a rank-three matrix with full nonnegative rank equal to n.     

Fréchet Algebra Techniques for Boundary Value Problems on Noncompact Manifolds: Fredholm Criteria and Functional Calculus via Spectral Invariance

A Boutet de Monvel type calculus is developed for boundary value problems on (possibly) noncompact manifolds. It is based on a class of weighted symbols and Sobolev spaces. If the underlying manifold is compact, one recovers the standard calculus. The following is proven:

• 1 The algebra G of Green operators of order and type zero is a spectrally invariant Fréchet subalgebra of L(H), H a suitable Hilbert space, i. e.,
• 2 Focusing on the elements of order and type zero is no restriction since there are order reducing operators within the calculus.
• 3 There is a necessary and sufficient criterion for the Fredholm property of boundary value problems, based on the invertibility of symbols modulo lower order symbols, and
• 4 There is a holomorphic functional calculus for the elements of G in several complex variables.

     

地区工业化阶段评估指标体系及其应用

本文对评估地区工业化阶段的指标体系进行了分析和探讨。首先，对现存的单一指标的指标体系逐个加以分析，重点指出单一指标在评估地区工业化阶段过程中存在的不足；其次探讨比较合理的综合评价的指标体系；最后，利用所述综合评价指标体系，对合肥市的工业化阶段进行了评估．     

N-半单代数与蕴涵代数

研究了有限结合代数与各种蕴涵代数的联系,得到了一些有趣的结果:N-半单代数的中心幂等元集G(R)按照“→”或者“*”等运算分别构成与蕴涵代数(F I代数、BCK代-数、BC I代-数、BCC代-数、W a jsberg代数等)等价的代数系统。     

“抽象代数”教学中的素质教育

从“抽象代数”课程的角度,围绕“建立代数体系、研究代数体系、区分代数体系、应用代数体系”四个方面,讨论教学过程中如何培养学生的数学能力和数学素质,如何实施素质教育.     

Contemplating Criteria for Science Education Reform: The Case of the Olympia School District

Proposals for current reform in science education elaborate national standards and a plethora of state-level interpretations commonly labeled as curriculum or learning frameworks. The purpose of this case study was to examine the dynamics of the science curriculum reform process in one of the first school districts to use the Georgia Framework for Learning Mathematics and Science as a basis for their reform initiative. The paper describes the ways in which members of the Olympia School District's Science Curriculum Committee participated in the science curriculum reform process, as well as their personal beliefs about the criteria needed for reform to take place. The results highlight the nature of metaphors guiding reform efforts; the influence of social, historical, economic, and political forces on the reform process; the use of local and professional languages as discourses for communicating about reform; and the complex power relations that influence the micropolitics of reform in the Olympia School District. This study has important implications for other teachers and school districts engaged in standards-based science curriculum reform. It points to the need for reform to include reflection and analysis of the role of teachers in the reform process and consideration of the purpose of science education reform in society.     

可补代数及其左正则代数的表示定理

设Ａ是右可补Ｂａｎａｃｈ代数,ＬＡ和Ｍｌ（Ａ）分别表示 Ａ的左正则和左乘子代数．本文给出了Ｍｌ（Ａ）是右可补或者零化子代数的一些充要条件,并借助于Ａ和ＬＡ的补子间的关系,给出了Ａ和ＬＡ的表示之间的关系．     

SAT:Algebra and Functions

1. Frank＇s gas tank was 1/4full. After put ting in G gallons of gasoline, the tank was 5/6full. What was the capacity of the tank.     

Building the Additive Utility Functions for CAD-UFRJ Evaluation Staff Criteria

This paper presents an application of the UTA method for building utility functions for the evaluation criteria defined by the Staff Evaluation Commission (CAD) of the Rio de Janeiro Federal University (UFRJ). Every year, the CAD-UFRJ gives the staff evaluation results for each Postgraduate Engineering Programme. However, the method used to generate the staff evaluation is assumed unknown. Trying to find the CAD-UFRJ preference structure, the evaluation results supplied by CAD-UFRJ are used to apply the UTA method. Some additional information obtained from the CAD-UFRJ data is incorporated in the optimal solutions analysis.     

粗糙集代数与MV代数

讨论粗糙集代数与MV代数的关系以及由粗糙集代数构造MV代数的方法.粗糙集代数本身具有格结构,证明了在适当选取蕴涵及乘积运算之后,粗糙集代数就成为MV代数.     

Finiteness Conditions for Hochschild Homology Algebra and Free Loop Space Cohomology Algebra

We prove that over a characteristic zero field, in most cases, neither the Hochschild homology algebra of a commutative algebra, nor the free loop space cohomology algebra of a topological space, is finitely generated.     

Witt代数和Virasoro代数上的Poisson代数结构

Poisson代数是指同时具有结合代数结构和李代数结构的一类代数,其结合代数结构和李代数结构满足Leibniz法则.确定了特征为0和特征为p>0的基域上的Witt代数和Virasoro代数上的Poisson代数结构.     

线性代数课程思政建设与教学实践

探讨了线性代数课程思政建设与教学实践.通过优化课程思政教学目标,从线性代数相关历史人物、课程知识点及教学拓展案例三个方面,积极挖掘课程思政元素切入点.加强课程思政教学团队建设,将思想政治教育融入到线性代数课堂混合式教学,增加对学生思政学习的过程性评价.教学实践表明,线性代数课程思政教育有利于培养学生的综合素质,受到学生...     

EI~n代数与*EI~n代数

为了更好地解决模糊概念的表示问题 ,文 [1]、 [2 ]引入了 AFS.代数和 AFS.结构。为了讨论AFS.结构的拓扑性质 ,本文在 [1]、 [2 ]的基础上 ,进一步讨论了 EIn 代数和 * EIn 代数的性质与结构。     

Geometric Algebra in Linear Algebra and Geometry

This article explores the use of geometric algebra in linear and multilinear algebra, and in affine, projective and conformal geometries. Our principal objective is to show how the rich algebraic tools of geometric algebra are fully compatible with and augment the more traditional tools of matrix algebra. The novel concept of an h-twistor makes possible a simple new proof of the striking relationship between conformal transformations in a pseudo-Euclidean space to isometries in a pseudo-Euclidean space of two higher dimensions. The utility of the h-twistor concept, which is a generalization of the idea of a Penrose twistor to a pseudo-Euclidean space of arbitrary signature, is amply demonstrated in a new treatment of the Schwarzian derivative.     

基于CDIO理念的线性代数课程教学改革

CDIO是当前高等工程教育的一种新型教育模式,对工程教育的基础课程教学具有同样的指导意义.本文针对工科线性代数课程的特点和教学现状,提出了基于CDIO理念的线性代数课程教学改革,立足于调动学生主动学习的积极性,对教学模式、教学方法与手段、实验教学、考核方式等方面进行探索,指出了主动式学习方式对提高教学质量和教学效果的重要作用.     

Criteria for quasi-convexity and pseudo-convexity: Relationships and comparisons

A first order criterion for pseudo-convexity and second order criteria for quasi-convexity and pseudo-convexity are given for twice differentiable functions on open convex sets. The relationships between these second order criteria and other known criteria are also analysed. Finally, the numbers of operations required to verify these criteria are calculated and compared.This research was supported by the Natural Sciences and Engineering Research Council Canada, Grant no. A8312, and by NATO Research Grant no. 1934.