拟环模的完全素根

本文引入了拟环模的完全素模,完全素根,完全左素理想,完全素环等概念,给出了完全素根的有关性质。     

完全二部图的边优美性

研究了完全二部图及其局部边迁移图的边优美性.主要结果有:当(m,n)=1时,奇阶完全二部图K_(m,n)为边优美图的充要条件是m+n|mn+1.     

3维格P_(n_1)P_(n_2)×P_(n_3)和台阶图的控制满划分

通过给出3维格P_n_1×P_n_2×P_n_3和台阶图S_(n_1,_n_2,_n_3)~(m)的控制满划分,证明了控制划分数 d(P_n_1×P_n_2×P_n_3)=4,d(S_(n_1,_n_2,_n_3)=4 (其中n_i≥2,i=1,2,3;m≥1).     

Engagement,passivity and detachment: 16‐year‐old students’ conceptions of politics and the relationship between people and politics

While there is a wealth of literature on young people and politics, most studies have examined their interest, trust and participation in politics as well as their attitudes toward and knowledge about formal politics. Little is known, however, about young people and the concept of politics. This article investigates 16‐year‐old students’ perceptions of the concept of politics and their conceptions of the relationship between people and politics. This knowledge is valuable for citizenship and social studies education, as an increasingly polarised political climate poses challenges to democratic politics and, consequently, to young people's political engagement and participation. In this study, semi‐structured interviews were conducted with nine students at five Norwegian upper secondary schools. The students varied in their interest and involvement in politics. A main finding is that the students perceived politics as processes related to shaping society, as decisions and activities related to ruling a country, and as the activities of discussion and debate. Three conceptions of the relationship between people and politics are presented: engagement, passivity, and detachment. In addition, while the 16‐year‐olds participated in political discussions privately and at school, they stated that they did not participate in political discussions in social media. Implications for citizenship and social studies education include the need to strengthen the bottom‐up perspective on politics and focus on in‐depth understanding of political processes and tools and methods of social‐scientific enquiry, as well as providing students with opportunities for and practice with handling opposition in political discussions online.     

一个新的平衡不完全区组设计2-(21,6,12)

利用投射平面PG(2,4)中的hyperoval作出了一个新的区组设计2-(21,6,12).     

关于Fibonacci三角形的猜想在k=4时的结果

证明了关于Fibonacci三角形的猜想在k=4时是成立的。     

三维无界区域上弱阻尼非线性Schrdinger方程的指数吸引子

Philippe Laurencot在文[1]中证明了弱阻尼非线性Schrdinger方程在无界区域R~n(N≤3)上存在一个最大的紧吸引子,本文在此基础上得到了R~3上指数吸引予的存在性。     

多元积分型Meyer-Knig-Zeller算子的L~p逼近

本文构造了一种多元积分型Meyer-K(?)nig-Zeller算子,给出了它在LP空间的逼近阶     

中学生解决实际问题能力表现的比较研究——青浦实验的新世纪行动之六

一、背景:为何关注学生的能力表现 在中国内地,"基本知识和基本技能"的教学尤其置于突出的地位,学生的解题能力极强.在传统的课堂教学中,教师使用大量的标准应用题:条件不多不少、过程相对封闭、结果标准单一,其"人造"痕迹明显,题目背景往往可以剥离.     

RECENT DEVELOPMENTS IN THE OSCILLATION OF NEUTRAL DELAY DIFFERENCE EQUATIONS WITH SUMMABLE COEFFICIENTS

This paper surveys some new results on the oscillation of all solutions of the linear nentral delaydifference equation of the form △(y_n - p_ny_(n-k)) q_ny_(n-l) = 0, n = 0,1, 2…where { p_n } and { q_n } are twe real numbers sequences with q_n≥0, and k and l are positive integers. These re-sults do not require the usual assumptionAlso, some interesting open problems on this topic am given.