关于Pappus、Desargues定理的证明

给出经典的Pappus定理和Desargues定理的几种证明．     

一类周期系数微分方程的周期解

讨论二次非线性系统周期解的存在性一般利用对角系统及指数型二分性通过压缩映射原理来实现,但在具体运用中,可能出现使用压缩映射原理条件要求较严格的现象.使用指数型二分性方法和Schauder不动点定理讨论一类二次周期系数微分方程周期解的存在性并给出具体解．该方法对条件的要求较低.     

施笃兹(Stolz)定理的推广及应用

极限论中求型和型的数列极限,应用Stolz定理非常有效,Stolz定理可说是求数列极限的洛必达(LHospital)法则。现将数列极限的Stolz定理推广到函数极限并结合例子说明其应用,为求函数极限提供新的方法。     

替换定理的两个证明

替换定理是高等代数 (线性代数 )中向量空间理论的一个十分重要的定理 ,文章给出了两个新证明。     

一类次线性三点边值问题正解的存在性

利用Krasnosel’skii不动点定理研究了一类次线性二阶非线性常微分方程三点边值问题正解的存在性问题,得到了正解存在的一个充分条件。     

留数定理在一类定积分中的计算

应用复变函数的思想可以求解多种形式的定积分。本文通过留数定理求出一类复杂函数的定积分。     

对人民币均衡汇率探讨

本文首先对当前人民币基本均衡汇率的研究成果给出了综述,然后对动态购买力平价理论做出分析和研究,指出动态购买力平价理论均衡汇率是符合中国国情的。最后对人民币均衡汇率给出估算。     

Connecting Science and Mathematics: The Nature of Proof and Disproof in Science and Mathematics

Disagreements exist among textbook authors, curriculum developers, and even among science and mathematics educators/researchers regarding the meanings and roles of several key nature-of-science (NOS) and nature-of-mathematics (NOM) terms such as proof, disproof, hypotheses, predictions, theories, laws, conjectures, axioms, theorems, and postulates. To assess the extent to which these disagreements may exist among high school science and mathematics teachers, a 14-item survey of the meanings and roles of the above terms was constructed and administered to a sample of science and mathematics teachers. As expected, the science teachers performed better than the mathematics teachers on the NOS items (44.1 versus 24.7%, respectively) and the mathematics teachers performed better than the science teachers on the NOM items (59.0 versus 26.1%, respectively). Nevertheless, responses indicated considerable disagreement and/or lack of understanding among both groups of teachers concerning the meanings/roles of proof and disproof and several other key terms. Therefore it appears that these teachers are poorly equipped to help students gain understanding of these key terms. Classroom use of the If/and/then/Therefore pattern of argumentation, which is employed in this paper to explicate the hypothesis/conjecture testing process, might be a first step toward rectifying this situation.     

正线性周期卷积算子在Lp_2π^p空间中的饱和等价定理

利用Holder不等式和Minkovski不等式得到一个不等式,利用得到的不等式得到了正线性周期卷积算子在L^p2π中的饱和等价定理,推广了谢庭藩和陈文忠的一些结果。     

EPR佯谬的正-反粒子对阐释

试图通过运用粒子-反粒子对重新阐释EPR佯谬.不同于D.Bohm所给出的工作于离散自旋空间的模型,这里仍然如同Einstein等人在他们的原始论文中一样考虑连续的坐标和动量变量.这里给出的阐释将有助于消除EPR模型中形式上的困惑.