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Ramsey chains in graphs 图中的拉姆齐链
IF 0.6 Q4 EDUCATION & EDUCATIONAL RESEARCH Pub Date : 2023-09-06 DOI: 10.47443/ejm.2023.029
G. Chartrand, Ritabrato Chatterjee, Ping Zhang
Let G be a graph with a red-blue coloring c of the edges of G . A Ramsey chain in G with respect to c is a sequence G 1 , G 2 , . . . , G k of pairwise edge-disjoint subgraphs of G such that each subgraph G i ( 1 ≤ i ≤ k ) is monochromatic of size i and G i is isomorphic to a subgraph of G i +1 ( 1 ≤ i ≤ k − 1 ). The Ramsey index AR c ( G ) of G with respect to c is the maximum length of a Ramsey chain in G with respect to c . The Ramsey index AR ( G ) of G is the minimum value of AR c ( G ) among all red-blue colorings c of G . A Ramsey chain with respect to c is maximal if it cannot be extended to one of greater length. The lower Ramsey index AR − c ( G ) of G with respect to c is the minimum length of a maximal Ramsey chain in G with respect to c . The lower Ramsey index AR − ( G ) of G is the minimum value of AR − c ( G ) among all red-blue colorings c of G . Ramsey chains and maximal Ramsey chains are investigated for stars, matchings, and cycles. It is shown that (1) for every two integers p and q with 2 ≤ p < q , there exists a graph with a red-blue coloring possessing a maximal Ramsey chain of length p and a maximum Ramsey chain of length q and (2) for every positive integer k , there exists a graph with a red-blue coloring possessing at least k maximal Ramsey chains of distinct lengths with prescribed conditions. A conjecture and additional results are also presented.
设G是一个图,它的边是红蓝色的c。G中关于c的拉姆齐链是一个序列g1, g2,…, G的成对边不相交子图的G k,使得每个子图G i(1≤i≤k)是大小为i的单色,并且G i同构于G i +1(1≤i≤k−1)的子图。G对c的拉姆齐指数AR c (G)是G中拉姆齐链对c的最大长度。G的拉姆齐指数AR (G)是所有G的红蓝颜色c中AR c (G)的最小值。关于c的拉姆齐链是极大的,如果它不能扩展到更长的拉姆齐链。G相对于c的Ramsey下标AR−c (G)是G相对于c的极大Ramsey链的最小长度。G的下拉姆齐指数AR−(G)是G的所有红蓝着色c中AR−c (G)的最小值。研究了Ramsey链和极大Ramsey链的星型、匹配型和环型。证明了(1)对于每两个2≤p < q的整数p和q,存在一个红蓝着色的图,其最大Ramsey链的长度为p,最大Ramsey链的长度为q;(2)对于每一个正整数k,存在一个红蓝着色的图,其具有至少k个不同长度的极大Ramsey链,且具有规定的条件。本文还提出了一个猜想和一些附加结果。
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引用次数: 1
Connected domination number and traceable graphs 连通支配数和可追溯图
IF 0.6 Q4 EDUCATION & EDUCATIONAL RESEARCH Pub Date : 2023-09-04 DOI: 10.47443/ejm.2023.027
Phillip Mafuta
Let G be a simple connected graph with minimum degree δ , second minimum degree δ (cid:48) , and connected domination number γ c ( G ) . It is shown that G has a spanning path whenever γ c ( G ) ≥ n − δ (cid:48) − 1 . This result is best possible for δ (cid:48) < 3 ; that is, if γ c ( G ) ≥ n − δ (cid:48) − 2 and δ (cid:48) < 3 , then G may or may not contain a spanning path. Also, this result settles completely a conjecture posed recently by Chellali and Favaron. In addition, for every choice of δ (cid:48) and δ , an infinite family of non-traceable graphs satisfying δ (cid:48) > δ and γ c ( G ) ≤ n − 2 δ (cid:48) is provided, which shows that if another recent conjecture by Chellali and Favaron is true, then it is best possible in a sense. The obtained results, apart from addressing some stronger versions of conjectures generated by the computer program Graffiti.pc, improve some known results.
设G为具有最小度δ、第二次最小度δ (cid:48)和连通支配数γ c (G)的简单连通图。结果表明,当γ c (G)≥n−δ (cid:48)−1时,G具有生成路径。当δ (cid:48) < 3;即,如果γ c (G)≥n−δ (cid:48)−2且δ (cid:48) < 3,则G可能包含也可能不包含生成路径。此外,这一结果完全解决了最近由Chellali和Favaron提出的一个猜想。此外,对于δ (cid:48)和δ的每一个选择,都给出了满足δ (cid:48) > δ和γ c (G)≤n−2 δ (cid:48)的无限族非可迹图,这表明如果Chellali和Favaron最近的另一个猜想成立,那么它在某种意义上是最可能的。获得的结果,除了解决了计算机程序涂鸦产生的一些更强版本的猜想之外。Pc,改进一些已知的结果。
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引用次数: 1
Weakly (m,n)–semiprime submodules 弱(m,n) -半素子模
IF 0.6 Q4 EDUCATION & EDUCATIONAL RESEARCH Pub Date : 2023-07-31 DOI: 10.47443/ejm.2023.017
Mohammed Issoual
This article gives several properties of a new type of submodules, namely weakly ( m, n ) -semiprime submodules where m and n are positive integers satisfying m > n . The primary objectives of the present article are to characterize weakly ( m, n ) - semiprime submodules and to provide a new characterization of the von Neumann regular modules in terms of weakly ( m, n ) -semiprime submodules.
本文给出了一类新的子模弱(m, n) -半素子模的几个性质,其中m和n是满足m > n的正整数。本文的主要目的是表征弱(m, n) -半素子模,并提供用弱(m, n) -半素子模表示的von Neumann正则模的一种新的表征。
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引用次数: 0
Taking notes as a strategy for solving reality-based tasks in mathematics 记笔记作为解决数学中基于现实的任务的策略
IF 0.6 Q4 EDUCATION & EDUCATIONAL RESEARCH Pub Date : 2023-07-01 DOI: 10.29333/iejme/13312
Lisa-Marie Wienecke, D. Leiss, T. Ehmke
This study investigates the extent to which student and task-related characteristics are associated with different types of note-taking and analyzes how task success depends on these elements. For this purpose, a sample of n=866 students (age: mean=13.99) completing two reality-based tasks as part of a paper and pencil test are considered. The results demonstrate that the note-taking type differs significantly between the two parallel constructed tasks. For example, language skills (r=.26), interest in mathematics (r=.13), and the socio-economic statuses (r=.12) are observed to be significantly correlated to greater note-taking frequency. Based on linear regression (dependent variable: successful task solution), 34% of the variance is attributed to note-taking and other student characteristics. The most relevant predictor for a successful task solution (β=.36) is notes containing an elaboration of the given task information.
本研究调查了学生和任务相关特征在多大程度上与不同类型的笔记相关联,并分析了任务成功是如何依赖于这些因素的。为此,考虑了n=866名学生(年龄:平均=13.99)的样本,他们完成了两个基于现实的任务,作为纸笔测试的一部分。结果表明,两种平行构建任务的笔记类型存在显著差异。例如,语言技能(r= 0.26)、对数学的兴趣(r= 0.13)和社会经济地位(r= 0.12)被观察到与更高的笔记频率显著相关。基于线性回归(因变量:成功的任务解决方案),34%的方差归因于记笔记和其他学生特征。一个成功的任务解决方案最相关的预测因子(β=.36)是包含给定任务信息的详细说明的注释。
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引用次数: 0
Designing mathematics standards in agreement with science 设计符合科学的数学标准
IF 0.6 Q4 EDUCATION & EDUCATIONAL RESEARCH Pub Date : 2023-07-01 DOI: 10.29333/iejme/13179
J. Hartman, Sarah Hart, Eric Alan Nelson, P. Kirschner
To learn mathematics, historically students had no choice but to memorize fundamental facts and apply memorized algorithms. Since 1995 in the US, all states have adopted standards to govern K-12 mathematics instruction, and in most, standards have de-emphasized memorization and emphasized reasoning based on concepts. This change assumed the brain could reason in mathematics without relying on memorized knowledge. Scientists who study the brain have recently verified this assumption was mistaken. Due to stringent limitations in working memory (where the brain solves problems), mathematical problem-solving of any complexity requires applying well-memorized facts and procedures. A decade after the implementation of standards in most states, US young adults ranked last in testing in mathematics among 22 nations. Changes are proposed to state K-12 standards, which recent scientific research suggests would substantially improve student mathematics achievement.
在历史上,为了学习数学,学生们别无选择,只能背诵基本的事实,并运用记忆中的算法。自1995年以来,美国所有州都采用了管理K-12数学教学的标准,在大多数标准中,不再强调记忆,而是强调基于概念的推理。这种变化假设大脑可以在不依赖记忆知识的情况下进行数学推理。研究大脑的科学家最近证实了这种假设是错误的。由于工作记忆(大脑解决问题的地方)的严格限制,任何复杂的数学问题都需要应用记忆良好的事实和程序。在大多数州实施标准十年后,美国年轻人在22个国家的数学测试中排名最后。最近的科学研究表明,州K-12标准的变化将大大提高学生的数学成绩。
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引用次数: 1
Connections between achievement emotions and covariational reasoning: The case of Valeria 成就情绪与协变推理之间的联系:以瓦莱里娅为例
IF 0.6 Q4 EDUCATION & EDUCATIONAL RESEARCH Pub Date : 2023-07-01 DOI: 10.29333/iejme/13180
Cristian Nava Guzmán, M. S. G. García González, Mario Sánchez Aguilar
This research explores the link between achievement emotions and covariational reasoning, a type of mathematical reasoning involving two variables. The study employs a case study approach, focusing on a high school calculus student named Valeria, and develops a theoretical framework based on the control-value theory and levels of covariational reasoning. The results reveal that Valeria’s ability to coordinate variables and her perceived importance of solving mathematical problems influence her experience of achievement emotions, including enjoyment and frustration. The case study enables the creation of a hypothetical model that explains how students feel achievement emotions when tackling mathematical tasks that require covariational reasoning. The study highlights the significance of comprehending the interplay between emotions and mathematical reasoning to cultivate advanced cognitive and emotional abilities. This research is essential in bridging the gap between emotions and mathematical reasoning, a topic that has been previously overlooked in research on the affective domain.
这项研究探讨了成就情绪和协变推理之间的联系,协变推理是一种涉及两个变量的数学推理。本研究采用个案研究的方法,以一位名叫Valeria的高中微积分学生为研究对象,基于控制值理论和协变推理的水平,建立了一个理论框架。结果显示,Valeria协调变量的能力和她对解决数学问题的重要性的感知影响了她对成就情绪的体验,包括快乐和沮丧。案例研究可以创建一个假设模型,解释学生在处理需要协变推理的数学任务时如何感受到成就感。该研究强调了理解情感与数学推理之间的相互作用对于培养高级认知和情感能力的重要性。这项研究对于弥合情感和数学推理之间的差距至关重要,这是一个以前在情感领域研究中被忽视的主题。
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引用次数: 0
Specifying and identifying signs of ‘resonance’ in teachers’ professionalization processes as a condition for teacher change 明确和识别教师专业化过程中“共鸣”的迹象,作为教师变革的条件
IF 0.6 Q4 EDUCATION & EDUCATIONAL RESEARCH Pub Date : 2023-07-01 DOI: 10.29333/iejme/13307
Carina Büscher, M. Andresen
Many studies on professionalization research deal with the question of how teachers actually learn or how teacher change occurs. In this context, Clarke and Hollingsworth (2002) describe a model for capturing teacher change in different domains (external, personal, domain of practice and domain of consequence) and how changes in one domain can affect other domains over time. The present article suggests the notion of resonance for analyzing teachers’ professionalization processes in order to better understand the reasons for teacher change on a micro level in their complexity. The idea was to supplement the model by the dimension of teachers’ professional conditions, to capture and describe the phenomenon that an active process of engagement with the professional development (PD) content is set in motion. We consider teachers’ resonance to be a condition for a successful professionalization process. Insights from two different research projects from Germany and Norway demonstrate the scope of the notion of resonance. Consequences for facilitators and the design of further PD programs are discussed.
许多关于专业化研究的研究都涉及教师如何实际学习或教师变化如何发生的问题。在这种背景下,Clarke和Hollingsworth(2002)描述了一个模型,用于捕捉教师在不同领域(外部领域、个人领域、实践领域和后果领域)的变化,以及一个领域的变化如何随着时间的推移影响其他领域。本文提出共振的概念来分析教师专业化的过程,以便在微观层面上更好地理解教师专业化变化的原因。这个想法是通过教师专业条件的维度来补充模型,以捕捉和描述一个积极参与专业发展(PD)内容的过程的现象。我们认为教师的共鸣是一个成功的专业化进程的条件。来自德国和挪威的两个不同研究项目的见解展示了共振概念的范围。讨论了对促进者的影响和进一步PD计划的设计。
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引用次数: 0
Mental abacus training affects high-level executive functions: Comparison of activation of the frontal pole 心算训练对高级执行功能的影响:额极激活的比较
IF 0.6 Q4 EDUCATION & EDUCATIONAL RESEARCH Pub Date : 2023-07-01 DOI: 10.29333/iejme/13220
Nobuki Watanabe
The role of executive function training in supporting child development has been increasingly studied. Executive function is largely related to the prefrontal cortex. The anterior portion of the prefrontal cortex, which is area 10 on the Brodmann map, is essential for the emergence of higher-order executive functions. Accumulating evidence indicates that mental abacus training, which is closely related to mathematics education, activates the prefrontal cortex. Based on these findings, it can be hypothesized that the mental abacus is valuable for training more advanced functions. Therefore, this study analyzed the activation of children’s brains with a focus on the frontal pole (Brodmann area 10). The results illustrated that mental abacus task more strongly activated the brain than piano task, the marshmallow test, or letter–number sequencing tasks. Thus, it was suggested that the mental abacus is valuable for training higher-level executive functions (i.e., frontal pole).
执行功能训练在支持儿童发展中的作用已得到越来越多的研究。执行功能在很大程度上与前额皮质有关。前额叶皮层的前部,也就是布罗德曼图上的第10区,对高级执行功能的出现至关重要。越来越多的证据表明,心算训练与数学教育密切相关,可以激活前额叶皮层。基于这些发现,可以假设心算对于训练更高级的功能是有价值的。因此,本研究分析了儿童大脑的激活情况,重点关注额极(Brodmann区10)。结果表明,心算任务比钢琴任务、棉花糖测试或字母数字排序任务更能激活大脑。因此,我们认为心算对高级执行功能(即额极)的训练是有价值的。
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引用次数: 0
Pre-service mathematics teachers’ learning to notice student statistical thinking in the context of lesson study 职前数学教师在课堂学习中注意学生统计思维的学习
IF 0.6 Q4 EDUCATION & EDUCATIONAL RESEARCH Pub Date : 2023-07-01 DOI: 10.29333/iejme/13398
Nadide Yilmaz, Iffet Elif Yetkin Ozdemir
It is important to note that the development of pre-service teachers’ noticing abilities does not happen spontaneously; hence, assistance programs are crucial. This qualitative study aimed to examine pre-service teachers’ noticing of student thinking within the context of lesson study. Three pre-service teachers conducted three lesson study cycles. Lesson plans, voice and video recordings of lesson study meetings and implementations, observations, field notes, and reflective writings are used as data collection techniques. The findings indicated that the pre-service teachers’ early levels of noticing were constrained. Their noticing levels increased as the lesson study progressed. Hence, the improvement of pre-service teachers’ noticing abilities can be assisted by lesson study. Activities such as planning, reflection and implementation helped pre-service teachers develop their noticing levels. To enhance the development of noticing skills, it can be proposed that lesson study should be integrated into teacher training programs.
值得注意的是,职前教师注意能力的发展不是自发的;因此,援助计划至关重要。本质性研究旨在考察职前教师在课堂学习情境下对学生思维的注意。三位职前教师进行了三个课程学习周期。课程计划、课程研究会议和实施的语音和视频记录、观察、实地笔记和反思性写作被用作数据收集技术。研究结果表明,职前教师的早期注意水平受到限制。随着课程学习的进行,他们的注意水平也在提高。因此,课程学习有助于职前教师注意能力的提高。计划、反思和实施等活动有助于职前教师提高他们的注意水平。为了提高注意技能的发展,可以提出将课堂学习纳入教师培训计划。
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引用次数: 0
How argumentation relates to formal proof process in geometry 几何中的论证与形式证明过程有什么关系
IF 0.6 Q4 EDUCATION & EDUCATIONAL RESEARCH Pub Date : 2023-07-01 DOI: 10.29333/iejme/13214
Esra Demiray, Mine Işıksal-Bostan, Elif Saygı
This study aims to examine how being involved in an argumentation process relates to the formal proof process in geometry. Prospective mathematics teachers were involved in an argumentation process while producing conjectures before engaging in formal proof of the recently produced conjectures. To collect data, four geometry-proof tasks that involve two sections were employed. The first section of the tasks demands the production of conjectures, which stands for the term argumentation. The second section asks for the formal proof of one of the recently produced conjectures. Based on the data analysis, the affordances of being involved in argumentation before engaging in the formal proof process were listed as positive affective occasions, arrangement of knowledge related to the content of the task, visual aspect, and the veracity of the statement. Negative affective occasions and confusion related to the difference between conjecturing and proving were coded as constraints of being involved in argumentation before formal proof.
本研究旨在研究如何参与论证过程与几何中的形式证明过程有关。未来的数学教师在对最近产生的猜想进行正式证明之前,在产生猜想的过程中参与论证过程。为了收集数据,采用了涉及两个部分的四个几何证明任务。任务的第一部分要求提出猜想,也就是所谓的论证。第二部分要求对最近产生的一个猜想进行正式证明。根据数据分析,在参与正式证明过程之前参与论证的辅助因素被列出为积极的情感场合、与任务内容相关的知识安排、视觉方面和陈述的真实性。与推测和证明之间的差异有关的消极情感场合和混淆被编码为在正式证明之前参与论证的约束。
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引用次数: 1
期刊
International Electronic Journal of Mathematics Education
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