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Chebyshev systems obtained by translations of a single function 由单个函数的平移得到的切比雪夫系统
IF 3.5 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2023-01-01 DOI: 10.12988/ams.2023.917397
K. Kitahara, Shiki Harada
Let ϕ ( x ) be an n − 1 times continuously differentiable function on an open interval of R . In this note, we study a necessary and sufficient condition of ϕ ( x ) that a system { ϕ ( x − x 1 ) , . . . , ϕ ( x − x n ) } obtained by any distinct n points x 1 , . . . , x n is an extended complete Chebyshev system
设φ (x)是开区间R上的n−1次连续可微函数。本文研究了系统{φ (x−x 1),…的一个充分必要条件。, φ (x−x n)}由任意不同的n个点x 1,…, xn是一个扩展的完全切比雪夫系统
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引用次数: 0
The Burundians' perception of the causes of the fall of CEPGL 布隆迪人对CEPGL垮台原因的看法
IF 3.5 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2023-01-01 DOI: 10.12988/ams.2023.917429
Floribert Manirakiza, Pascal Niyonizigiye, Germain Ngoie Tshibambe
Composed of three member countries, the Economic Community of the Great Lakes Countries has suffered from a prolonged lethargy since the 1990s. Over four decades of existence, the community has had practical difficulties in fulfilling its missions. Long before his fall, many projects were already executed and others in progress. Our study aims to seek the main causes of its fall through responses to the census using a questionnaire with closed and open questions administered to 158 students from the University of Burundi and the Higher Teacher Training School. The results show that 23,46% believe that the fall is due to insecurity in the sub-region, 13.92% point to the ignorance of political leaders, 17,08% give they opinion about a lack of will for regional integration by political leaders and 15.82% consider that the fall was caused by the lack of financial means on the part of member countries.
由三个成员国组成的大湖国家经济共同体自上世纪90年代以来长期处于停滞状态。在四十多年的存在中,社区在履行其使命方面遇到了实际困难。早在他下台之前,许多项目已经开始实施,还有一些正在进行中。我们的研究旨在通过对布隆迪大学和高等教师培训学校的158名学生进行问卷调查,找出其下降的主要原因。问卷调查包含封闭式和开放式问题。结果显示,23.46%的人认为下降是由于次区域的不安全,13.92%的人指出政治领导人的无知,17,08%的人认为政治领导人缺乏区域一体化的意愿,15.82%的人认为下降是由于成员国缺乏财政手段造成的。
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引用次数: 0
Infinitely many solutions for the Dirichlet boundary value problem for variable coefficient fractional differential equations with instantaneous impulses via critical point theory 用临界点理论求瞬时脉冲变系数分数阶微分方程Dirichlet边值问题的无穷多解
IF 3.5 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2023-01-01 DOI: 10.12988/ams.2023.917493
S. Chen, Guoping Chen
In this paper, the existence of infinite solutions to the Dirichlet boundary value problem for variable coefficient fractional differential equations with instantaneous impulses is discussed by using the the symmetric mountain pass lemma of critical point theory, and an example is given to illustrate the effect of the main result
本文利用临界点理论的对称山口引理,讨论了具有瞬时脉冲的变系数分数阶微分方程的Dirichlet边值问题无穷解的存在性,并举例说明了主要结果的影响
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引用次数: 0
A new iteration method for common fixed points of an infinite family of nonself asymptotically nonexpansive mappings 非自渐近非扩张映射无穷族公共不动点的一种新的迭代方法
IF 3.5 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2023-01-01 DOI: 10.12988/ams.2023.917270
Wei-Qi Deng, Jing-Xin Na
In this paper, we mainly study the convergence theorem for common fixed points of an infinte family of nonself asymptotically nonexpansive mappings form a nonempty closed convex subset of a real uniformly convex Banach space to the whole space. By using a specific way of choosing the indexes of the involved mappings, we propose an optimum iterative approach to approximating common fixed points of countable families. Under some suitable conditons, a strong convergence theorem of the mappings is obtained. The result extends the situation of finite families of such mappings.
本文主要研究了由实一致凸Banach空间的非空闭凸子集构成的非自渐近非扩张映射无穷族的公共不动点到整个空间的收敛定理。通过选择映射索引的特定方法,我们提出了一种逼近可数族公共不动点的最优迭代方法。在适当的条件下,得到了映射的一个强收敛定理。结果推广了这类映射有限族的情况。
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引用次数: 0
Articulation point and weak point in a space and in a network in pretopology: the case of the connectivity 预拓扑学中空间和网络的连接点和弱点:连通性的情况
IF 3.5 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2023-01-01 DOI: 10.12988/ams.2023.917346
Monique Dalud-Vincent
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引用次数: 0
Existence of spatial economic equilibrium: a proof utilizing the Borsuk-Ulam theorem 空间经济均衡的存在性:利用Borsuk-Ulam定理的证明
IF 3.5 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2023-01-01 DOI: 10.12988/ams.2023.917325
P. Stiefenhofer, A. Gregoriou
In this paper, we study spatial economic equilibrium of a single good economy distributed over the earth’s equator using a representative agent model with linear demand and supply functions. We show using Borsuk Ulam’s theorem that there exist antipodal economic activities with associated equilibrium prices
本文利用具有线性需求和供给函数的代表性代理模型,研究了分布在地球赤道上的单一商品经济的空间经济均衡问题。我们利用Borsuk Ulam定理证明了存在具有相关均衡价格的对跖经济活动
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引用次数: 0
Qualification and employability of women in Burundian public industrial tea and energy companies 布隆迪公共工业茶叶和能源公司妇女的资格和就业能力
IF 3.5 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2023-01-01 DOI: 10.12988/ams.2023.917425
Jean Claude Jonya, Oscar Toyi, Alain Aime Ndendi, Ildephonse Sindayigaya
The concept of employability takes on a variety of dimensions and contours in the literature, which certainly implies the development of skills and adaptation to changes in employees' jobs. Despite the large number of works devoted to skills and employability, there is little work to clarify the links between these two concepts in Burundian tea and energy industrial enterprises. The objective of our article is to define the elements of an answer to the following question: how can the management of qualifications ensure the employability of Burundian women in tea and energy companies? In this article, we propose a conceptual and exploratory approach at the level of five tea companies and one company producing and distributing water and electricity. First, we present a state of the art on the concepts of individual qualification and employability, and their relationship, and then we discuss the elements that guarantee women's employability.
在文献中,就业能力的概念呈现出各种各样的维度和轮廓,这当然意味着技能的发展和适应员工工作的变化。尽管有大量的工作致力于技能和就业能力,但很少有工作澄清布隆迪茶叶和能源工业企业中这两个概念之间的联系。本文的目的是定义以下问题的答案要素:资格管理如何确保布隆迪妇女在茶叶和能源公司的就业能力?在本文中,我们提出了一个概念性和探索性的方法,在五个茶叶公司和一个生产和分配水电的公司的层面。首先,我们介绍了个人资格和就业能力的概念及其关系的最新进展,然后讨论了保障妇女就业能力的要素。
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引用次数: 3
Language skills of 5th grade pupils in Burundi during the learning of mathematics in French: linguistic and gestural indices 布隆迪五年级学生在法语数学学习期间的语言技能:语言和手势指数
IF 3.5 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2023-01-01 DOI: 10.12988/ams.2023.917326
Wenceslas Sinabajije, M. Bento
This article presents a study on the evaluation of the language skills of pupils in 5 fundamental year in Burundi in Mathematics. The behavioural indices of the pupils in oral and written comprehension and expression revealed that their main weaknesses were in oral and written expression. In the absence of oral formulation of their own ideas, some pupils limited themselves to answering in one word or in incomplete sentences while others preferred to remain silent or to express themselves in Kirundi. In listening comprehension, they had no problem. They answered the questions and performed the tasks they had been given orally in French. In reading comprehension, they also managed to appropriate the useful information read.
本文介绍了一项关于布隆迪数学五年级小学生语言技能评价的研究。学生在口头和书面理解和表达方面的行为指标显示,他们的主要弱点在于口头和书面表达。由于不能口头表达自己的想法,一些学生限制自己用一个词或不完整的句子来回答,而另一些学生则宁愿保持沉默或用基隆迪语表达自己。在听力理解方面,他们没有问题。他们用法语口头回答问题并完成任务。在阅读理解中,他们也成功地将所读到的有用信息挪用。
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引用次数: 0
Project management and analysis of investment plans in public works: optimization processes choices to maximize resource allocation results 公共工程项目管理与投资计划分析:优化过程选择,使资源配置结果最大化
IF 3.5 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2023-01-01 DOI: 10.12988/ams.2023.917427
A. A. Arnao, R. Guarneri, R. Lo Bosco, A. Puglisi
In applied sciences, such as economics, engineering, mobility and lo-gistics problems, management, etc., Integer Linear Programming (ILP) deals in a systematic way with the minimization (maximization) problem of a linear function with several variables (some also of a random nature), subject to equality constraints and Integer Linear Programming (ILP) deals in a systematic way with the minimization (maximization) problem of a linear function with several variables (some also of a random nature), subject to equality constraints and linear inequality and to the constraint that one or more variables has integer values. This mathematical approach is essential to address and solve a very large number of real problems, typical of the applied sciences, when there is an indivisibility of the good to be produced or of the resource to be used and thus the consequent need to represent the problem through models of Linear Programming with integer variables. The applications of the method concern many applications of modern society and extend from industrial analysis for the distribution of goods and the sequenc-ing of productive activities, to economic problems aimed at the optimal management of a securities portfolio, to those of planning and optimal planning of public investments, to the problems inherent in biology, high
在应用科学中,如经济学、工程学、流动性和物流问题、管理学等,整数线性规划(ILP)以系统的方式处理具有多个变量(有些也是随机性质)的线性函数的最小化(最大化)问题。整数线性规划(ILP)以系统的方式处理具有多个变量(其中一些也是随机的)的线性函数的最小化(最大化)问题,这些变量受等式约束和线性不等式的约束,以及一个或多个变量具有整数值的约束。这种数学方法对于处理和解决大量的实际问题至关重要,这是应用科学的典型问题,当要生产的产品或要使用的资源不可分割时,因此需要通过具有整数变量的线性规划模型来表示问题。该方法的应用涉及现代社会的许多应用,从商品分配和生产活动排序的工业分析,到以证券投资组合的最佳管理为目标的经济问题,到公共投资的规划和最佳规划,再到生物学固有的问题
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引用次数: 0
Solving triangles algebraically 用代数方法求解三角形
IF 3.5 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2023-01-01 DOI: 10.12988/ams.2023.917399
Joseph Bakhos
Quaterns are a new measure of rotation. Since they are defined in terms of rect-angular coordinates, all of the analogue trigonometric functions become algebraic rather than transcendental. Rotations, angle sums and differences, vector sums, cross and dot products, etc., all become algebraic. Triangles can be solved algebraically. Computer algorithms use truncated infinite sums for the transcendental calculations of these quantities. If rotations were expressed in quaterns, these calculations would be simplified by a few orders of magnitude. This would have the potential to greatly reduce computing time. The archaic Greek letter koppa is used to represent rotations in quaterns, rather than the traditional Greek letter theta. Because calculations utilizing quaterns are algebraic, simple rotation in the first two quadrants can be done ”by hand” using ”pen and paper.” Using the approximate methods outlined towards the end of the paper, triangles may be approximately solved with an error of less than 3% using algebra and a few simple formulas.
四元数是一种新的旋转度量。由于它们是用直角坐标定义的,所有的模拟三角函数都变成了代数函数而不是超越函数。旋转,角度和和差,向量和,叉乘和点乘,等等,都变成了代数。三角形可以用代数方法求解。计算机算法使用截断的无限和来进行这些量的超越计算。如果旋转以四元数表示,这些计算将被简化几个数量级。这将有可能大大减少计算时间。古希腊字母koppa以四元数表示旋转,而不是传统的希腊字母theta。因为使用四元数的计算是代数的,所以在前两个象限中的简单旋转可以使用“笔和纸”“手工”完成。使用本文最后概述的近似方法,可以用代数和一些简单的公式以小于3%的误差近似求解三角形。
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Mathematical Models & Methods in Applied Sciences
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