函数迭代所产生的周期函数列

探讨了函数迭代所产生的周期函数列及其在判别周期函数上的应用,进一步推广了文［３］、［４］的结论。     

高中数学奥林匹克竞赛知识讲座——函数

1 知识点释要函数是高中数学的基础.在每年的全国高中数学联赛中,函数问题以各种不同的形式出现,而且出现的比重也较高.3年来,这方面出现的试题主要有函数性质、函数方程、函数最值和不等式、函数迭代的问题.例如2005年联赛第8题、2006年联赛第2题考查了函数的单调性;2006年联赛第5题考查了函数的单调性和奇偶性;2006年联赛第7题考查了值域的求法;2004年联赛第8题考查了函数方程和赋值法;2006年联赛第15题考查了函数迭代;2004年联赛第3题和第15题以及2005年的第1题考查     

函数教程的改革

实验版本新教材的最大特点是改变了教材的呈现方式,要求教师的教育理念和学生的学习理念发生改变,从而改变教师的教学行为和学生的学习行为,而函数正是刻画变量的有效数学模型。本文通过对函数概念教学的研究,探讨了新课程标准带来的一系列变化及应对措施。     

转化法在讨论二元涵数有关问题中的应用

对多元函数的研究,通常是把多元函数问题转化为一元函数问题,再利用一元函数的结论推证,本文总结了在多元函数微分学数学中这种转化的几种常用方法。     

浅谈函数在高等数学中的应用

本文讨论了辅助函数的应用,分析了求函数表达式的几种情形及相应求法、函数积分的应用、举例分析.具有深刻的理论意义和广泛的实际应用价值.     

关于初等函数的几点注记

讨论了基本初等函数的判定以及初等函数的构成和初等函数的判断,对现行教材中初等函数的定义提出了商讨意见。     

关于初等函数的几点注记

讨论了基本初等函数的判定以及初等函数的构成和初等函数的判断,对现行教材中初等函数的定义提出了商讨意见。     

关于两个复合函数的不等式性质

本文引进了复合伽玛函数的定义,用伽玛函数的性质讨论了两个复合函数的不等式性质,并就该函数的单调性进行了讨论.     

初等超越函数超越性的证明

在中学数学里,仅研究初等超越函数,但对其证明没有涉及,作为教师,应该掌握初等函数超越性的证明。文章首先介绍了初等函数的定义及其分类,进而分析了各类初等函数的定义,接着探讨了指数函数的超越性、三角函数、反三角函数的超越性等问题。     

用函数的观点研究行列式

给出了行列式函数的概念,建立了行列式与函数的关系,用行列式函数的性质证明了行列式的性质,并从分析的角度解决了代数学中的一些问题。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.