函数级数一致收敛的一个充要条件

证明了函数级数一致收敛的一个充要条件 ,进一步讨论了函数级数一致收敛的本质特征     

On the efficiency of two-stage and three-stage least squares estimators

This paper utilizes the results of Kruskal (1968), Zyskind (1967), and more recently Milliken and Albohali (1984) to derive a simple necessary and sufficient condition for 3SLS to be equivalent to 2SLS. This condition depends upon the inverse of the variance:covariance matrix of the disturbances, and the set of second stage regressors of each structural equation. More importantly, this condition should prove useful for econometric students and provides an easy method for checking sufficiency.     

论我国中小企业的生存与发展

当前,中小企业正成为人们关注的热点,在搞活中小企业的实践中出现了一些值得探讨的问题。本文就我国中小企业发展过程中面临的政策环境、竞争秩序、生产技术设备、技术创新体系等方面的困难和问题,提出需采取的相应对策及建议如创新、分工协作、融资渠道的开辟、服务机构的建立及法律的制定和完善等,进而提出了中小企业的发展对我国的特殊意义。     

关于无穷积分integral from n=o to ( ∞)f(x)dx收敛的必要条件

本文从无穷级数收敛的必要条件出发,通过无穷积分和无穷级数的紧密联系,给出无穷积分收敛的一个必要条件。     

后验必然命题：对“休谟问题”的形而上学回答

克里普克通过＂名称是严格指示词＂的先天直觉,证明了专名之间的同一性命题、理论同一性命题和自然种类的一般陈述等后验命题具有普遍必然性。克里普克的后验必然命题是对＂休谟问题＂的形而上学回答,这一论证在认识论领域掀起了一场重要的革命,产生了深远的影响。     

Experience Simpson's Paradox in the Classroom

Simpson's paradox is a challenging topic to teach in an introductory statistics course. To motivate students to understand this paradox both intuitively and statistically, this article introduces several new ways to teach Simpson's paradox. We design a paper toss activity between instructors and students in class to engage students in the learning process. We show that Simpson's paradox widely exists in basketball statistics, and thus instructors may consider looking for Simpson's paradox in their own school basketball teams as examples to motivate students’ interest. A new probabilistic explanation of Simpson's paradox is provided, which helps foster students’ statistical understanding. Supplementary materials for this article are available online.     

论代位权行使过程中必要费用的承担

目前我国关于代位权行使过程中必要费用承担的规定有其合理性,但也存在很多的不足。对于代位权行使过程中必要费用的承担要区分债权人胜诉和败诉两种情况,否则对于债务人来说显失公平。债权人胜诉时的必要费用由债务人承担,但债权人败诉时的必要费用则可能由债权人自己来承担。关于必要费用的范围,在今后的立法改革中应当明确把诉讼费剔除出去,以消除现在存在的争议。当债权人胜诉时,次债务人承担诉讼费后,其可以不当得利为由对债务人行使偿还请求权,这就形成了另外一种法律关系,与目前诉讼费由次债务人承担的规定也并不矛盾。明确必要费用的范围,区分债权人胜诉和败诉两种情况是今后立法改革的重中之重。     

《幼学琼林》的特色及对国学的推介价值

《幼学琼林》是传统的蒙学课本中内容丰富、形式独特的经典教材。其至少有三大特点:以成语典故为主要内容,对收入的上千条成语及其典故都作了简洁而准确的考究和解释,有利于读者通过学习成语而掌握国学知识;全文的内容都是用对偶句表达,语皆求偶,典必成双,形式生动灵活,富有民族性、韵律美和可读性;以全面地传授国学知识为己任,较少封建伦理说教。因之,它具有较高的推介国学知识的价值,以作古为今用,应将其适当引入学校基础教育,在弘扬国学精华中发挥积极的作用。     

Strategy frames in coopetition: An examination of coopetition entry factors in high-tech firms

Collaboration with competitors offers unique advantages such as increasing market, innovation, and financial performance. However, the degree of coopetition adoption varies between firms, as does the ability to achieve intended outcomes. We address this variety through the lens of strategic frames, essential for understanding business environment interpretations that managers develop, interactions with other actors that they engage in, and the subsequent performance firms may achieve. We examine associations between external and internal coopetition factors as perceived by coopeting managers.To single out the coopetition factors seen by respondents as the most relevant and to evaluate their mutual associations, we apply traditional regression analyses on survey data collected from 352 high-technology firms in Poland. To fully embrace the causal complexity, we advance our regression-based insights by using a complementary necessary condition analysis (NCA) and bottleneck analysis.Our results suggest that coopeting managers place higher importance on customer-driven rather than on resource-driven coopetition factors when considered as sufficient leveraging factors. Still, the complementary NCA reveals internal resources as critical factors for the perception of external factors of coopetition. Finally, we identify external technological development as the most limiting bottleneck for the perception of most internal coopetition factors, highlighting coopetition as a technology-driven strategy.     

Rolle定理条件的充分非必要性

微分中值定理在整个微积分理论中起着重要的作用。以Ｒｏｌｌｅ定理为基础推证了其它中值定理。本文对Ｒｏｌｌｅ定理条件的充分非必要性进行剖析。采用两种手段：图形举例直观易懂；用实例论证。同时给出Ｒｏｌｌｅ定理的一种推广。