数学归纳法原理及其应用

数学归纳法是离散数学的重要内容，是计算机科学理论的重要组成部分。本文介绍有关数学归纳法原理及其应用。1自路四集的定义及其性质定义1［门没空集4的后继集记为若命名声为1，那么这样就得到自然数集合N＝11，2，3，4，··叫。从自然数集的定义中，可以直接得到以下基本性质：l）（N，＜）是全序集。即对VZI，12EN，必有出＜n。或nZ＜n；。此性质，使自然数集N的元素能按大小顺序排成一个无限序列：l，2，3，4，2）自然数集N是一个无限集。即在N的元素按大小顺序排列中，没有最大的数。也就是说，在此排列中，任意一个自然数后面还…     

最小数原理——数学归纳法的理论依据

归纳法和演绎法都是重要的数学方法,归纳法中完全归纳法和演绎法都是逻辑方法;不完全归纳法是非逻辑方法。只适用于数学发现思维,不适用数学严格证明。高中阶段学习的数学归纳法,是一种递归推理,是科学归纳法在数学中的应用与体现。数学归纳法是论证关于自然数的无限多个命题的重要方法,它的正确性源于自然数的归纳公理或最小数原理。     

试谈数学归纳法的实质

本文指出数学归纳法是对无穷集合而言的一种完全归纳法,它是通常所说的完全归纳法的一种推广.     

关于数学归纳法证题的注记

数学归纳法是数学证明中一个非常重要的方法，数学归纳法的形式有多种多样，其中最基本、最常用的是基于最小数原理的第一数学归纳法原理。令Ｎ表示全体非负整数的集：Ｎ＝｛０，１，２，３，……｝Ｎ表示全体自然数的集：Ｎ＝｛１，２，３，……｝最小数原理：自然数集Ｎ的任意一个非空子集Ｓ必含有一个最小数，也就是有这样一个数ａ∈Ｓ，对于任意ｃ∈Ｓ，ａｃ．由最小数原理可以得出以下的数学归纳法原理：设有一个与自然数ｎ有关的命题，如果１°　当ｎ＝１时，命题成立；２°　假设ｎ＝ｋ时命题成立，则ｎ＝ｋ＋１时命题也成立…     

中学阶段《数学归纳法》的理解

我们知道在数学问题中,利用数学归纳法可以证明一类与自然数有关的数学命题。但对数学归纳法的正确理解涉及一个缜密的逻辑思维过程,本文对中学阶段学习的数学归纳要求的逻辑思维过程理解做一个浅析阐述,以供同行商榷。     

有序集的一般归纳原理和连续归纳法

证明了一个适用于任意有序集的一般归纳原理,以此为基础导出了数学归纳法、超限归纳法和连续归纳法,从而揭示出三种归纳法的共同基础。文中的例子显示出连续归纳法可用统一模式简单明了地给出数学分析中若干定理的证明,如果在数学专业的分析教学中应用连续归纳法,将有助于克服长期存在的教学难点,提高教学的质量和效率。同时也为分析推理的机械化进行了必要的准备。     

浅析数学归纳法

数学归纳法是论证与自然数n有关的一类数学命题的重要方法,通过“有限”手段来证明“无限”的命题,它主要用于证明与自然数n有关的恒等式。不等式,整除问题。几何问题,数列的通项及求和公式等．     

浅谈数学归纳法的应用技巧

数学归纳法是中学数学教学内容中的重点与难点之一。重点是数学归纳法使用面比较广;难点则是因为它是学生第一次接触从有限到无限的认识方式,同时涉及到的知识和技巧较多。本文阐明了数学归纳法的原理及基本思维方法,并通过对典型例题的分析,揭示其在解题中的应用技巧。     

归纳谜明原理与归纳定义原理

归纳法的征明原理和定义原理,产生于对自然数理论的研究,早在1891年,Peano首先提出了关于自然数系的Peanb假定,这个假定的精髓就是假设在一个集合ω上存在一个仍取值于ω的函数S,它满足下述三个条件:     

“数学归纳法”在行列式证题中的关键

证明一个数学命题的常用方法有分析法、综合法,但有关自然数n的命题有些在利用分析法或综合法不易或不能给出证明,这时若采用数学归纳法则显的可行和简单。本文主要就行列式理论中的一些命题的证明给出自己的总结。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that