symmetry methods for differential equations,exercise 1.4
2013-11-12 23:47
393 查看
tex文档:
View Code
\documentclass[a4paper, 12pt]{article} % Font size (can be 10pt, 11pt or 12pt) and paper size (remove a4paper for US letter paper) \usepackage{amsmath,amsfonts,bm} \usepackage{hyperref} \usepackage{amsthm,epigraph} \usepackage{amssymb} \usepackage{framed,mdframed} \usepackage{graphicx,color} \usepackage{mathrsfs,xcolor} \usepackage[all]{xy} \usepackage{fancybox} \usepackage{CJKutf8} \newtheorem*{adtheorem}{定理} %\setCJKmainfont[BoldFont=FZYaoTi,ItalicFont=FZYaoTi]{FZYaoTi} \definecolor{shadecolor}{rgb}{1.0,0.9,0.9} %背景色为浅红色 \newenvironment{theorem} {\bigskip\begin{mdframed}[backgroundcolor=gray!40,rightline=false,leftline=false,topline=false,bottomline=false]\begin{adtheorem}} {\end{adtheorem}\end{mdframed}\bigskip} \newtheorem*{bdtheorem}{定义} \newenvironment{definition} {\bigskip\begin{mdframed}[backgroundcolor=gray!40,rightline=false,leftline=false,topline=false,bottomline=false]\begin{bdtheorem}} {\end{bdtheorem}\end{mdframed}\bigskip} \newtheorem*{cdtheorem}{Exercise} \newenvironment{exercise} {\bigskip\begin{mdframed}[backgroundcolor=gray!40,rightline=false,leftline=false,topline=false,bottomline=false]\begin{cdtheorem}} {\end{cdtheorem}\end{mdframed}\bigskip} \newtheorem*{ddtheorem}{注} \newenvironment{remark} {\bigskip\begin{mdframed}[backgroundcolor=gray!40,rightline=false,leftline=false,topline=false,bottomline=false]\begin{ddtheorem}} {\end{ddtheorem}\end{mdframed}\bigskip} \newtheorem*{edtheorem}{引理} \newenvironment{lemma} {\bigskip\begin{mdframed}[backgroundcolor=gray!40,rightline=false,leftline=false,topline=false,bottomline=false]\begin{edtheorem}} {\end{edtheorem}\end{mdframed}\bigskip} \newtheorem*{pdtheorem}{例} \newenvironment{example} {\bigskip\begin{mdframed}[backgroundcolor=gray!40,rightline=false,leftline=false,topline=false,bottomline=false]\begin{pdtheorem}} {\end{pdtheorem}\end{mdframed}\bigskip} \usepackage[protrusion=true,expansion=true]{microtype} % Better typography \usepackage{wrapfig} % Allows in-line images \usepackage{mathpazo} % Use the Palatino font \usepackage[T1]{fontenc} % Required for accented characters \linespread{1.05} % Change line spacing here, Palatino benefits from a slight increase by default \makeatletter \renewcommand\@biblabel[1]{\textbf{#1.}} % Change the square brackets for each bibliography item from '[1]' to '1.' \renewcommand{\@listI}{\itemsep=0pt} % Reduce the space between items in the itemize and enumerate environments and the bibliography \renewcommand{\maketitle}{ % Customize the title - do not edit title % and author name here, see the TITLE block % below \renewcommand\refname{参考文献} \newcommand{\D}{\displaystyle}\newcommand{\ri}{\Rightarrow} \newcommand{\ds}{\displaystyle} \renewcommand{\ni}{\noindent} \newcommand{\pa}{\partial} \newcommand{\Om}{\Omega} \newcommand{\om}{\omega} \newcommand{\sik}{\sum_{i=1}^k} \newcommand{\vov}{\Vert\omega\Vert} \newcommand{\Umy}{U_{\mu_i,y^i}} \newcommand{\lamns}{\lambda_n^{^{\scriptstyle\sigma}}} \newcommand{\chiomn}{\chi_{_{\Omega_n}}} \newcommand{\ullim}{\underline{\lim}} \newcommand{\bsy}{\boldsymbol} \newcommand{\mvb}{\mathversion{bold}} \newcommand{\la}{\lambda} \newcommand{\La}{\Lambda} \newcommand{\va}{\varepsilon} \newcommand{\be}{\beta} \newcommand{\al}{\alpha} \newcommand{\dis}{\displaystyle} \newcommand{\R}{{\mathbb R}} \newcommand{\N}{{\mathbb N}} \newcommand{\cF}{{\mathcal F}} \newcommand{\gB}{{\mathfrak B}} \newcommand{\eps}{\epsilon} \begin{flushright} % Right align {\LARGE\@title} % Increase the font size of the title \vspace{50pt} % Some vertical space between the title and author name {\large\@author} % Author name \\\@date % Date \vspace{40pt} % Some vertical space between the author block and abstract \end{flushright} } % ---------------------------------------------------------------------------------------- % TITLE % ---------------------------------------------------------------------------------------- \begin{document} \begin{CJK}{UTF8}{gkai} \title{\textbf{Symmetry Methods for Differential Equations:\\Exercise 1.4}} % \setlength\epigraphwidth{0.7\linewidth} \author{\small{叶卢庆}\\{\small{杭州师范大学理学院,学号:1002011005}}\\{\small{Email:h5411167@gmail.com}}} % Institution \renewcommand{\today}{\number\year. \number\month. \number\day} \date{\today} % Date % ---------------------------------------------------------------------------------------- \maketitle % Print the title section % ---------------------------------------------------------------------------------------- % ABSTRACT AND KEYWORDS % ---------------------------------------------------------------------------------------- % \renewcommand{\abstractname}{摘要} % Uncomment to change the name of the abstract to something else % \begin{abstract} % \end{abstract} % \hspace*{3,6mm}\textit{关键词:} % Keywords % \vspace{30pt} % Some vertical space between the abstract and first section % ---------------------------------------------------------------------------------------- % ESSAY BODY % ---------------------------------------------------------------------------------------- \begin{exercise}[1.4] Determine the value of $\alpha$ for which $$ (x',y')=(x+2\va,ye^{\alpha\va}) $$ is a symmetry of $$ \frac{dy}{dx}=y^2e^{-x}+y+e^x $$ for all $\va\in\mathbf{R}$. \end{exercise} \begin{proof} The symmetry condition for the differential equation is $$ \frac{\frac{\pa g}{\pa x}+\frac{\pa g}{\pa y}w(x,y)}{\frac{\pa f}{\pa x}+\frac{\pa f}{\pa y}w(x,y)}=w(f(x,y),g(x,y)). $$ Where $w(x,y)=y^2e^{-x}+y+e^x$,$f(x,y)=x+2\va,g(x,y)=ye^{\alpha\va}$.So the symmetry condition can be written as $$ y^2e^{-x+\alpha\va}+e^{x+\alpha\va}=y^2e^{2\alpha\va-x-2\va}+e^{x+2\va}. $$ So $\alpha=2$. \end{proof} % ---------------------------------------------------------------------------------------- % BIBLIOGRAPHY % ---------------------------------------------------------------------------------------- \bibliographystyle{unsrt} \bibliography{sample} % ---------------------------------------------------------------------------------------- \end{CJK} \end{document}
View Code
相关文章推荐
- symmetry methods for differential equations,exercise1.1
- Symmetry Methods for Differential Equations,Exercise 1.5
- Symmetry Methods for Differential Equations:A Beginner's Guide,Example1.2
- Symmetry Methods for Differential Equations,A Beginner's Guide,Example 1.3
- FEniCS: a user-friendly tool for solving partial differential equations (PDEs)
- Solving ordinary differential equations I(nonstiff problems),exercise 1.1
- Reading notes for the book "(Non-)Linear Partial Differential Equations for Engineers and Scientists"
- 读书笔记:Geometric and Fourier methods for nonliner wave equations
- Introduction to Differential Equations,Exercise 1.1,1.5,1.6,1.8,1.9,1.10
- Solving ordinary differential equations I(Nonstiff Problems),Exercise 1.2:A wrong solution
- Deep Learning 8_深度学习UFLDL教程:Stacked Autocoders and Implement deep networks for digit classification_Exercise(斯坦福大学深度学习教程)
- Graphical and Interactive Methods for Computer Games
- Advances in Security and Payment Methods for Mobile Commerce
- Data Mining Methods for Recommender Systems推荐读书笔记
- #197 – Override Application Class Methods for Standard Events(为Application类的标准事件重写方法)
- Solution for Exercise 4.33 of C++ Primer 5th Edition.
- exercise for printf functions in c run-time library
- UVa OJ 199 - Partial differential equations (偏微分方程)
- Top 10 Methods for Java Arrays
- 《Statistical Methods for Recommender Systems》阅读笔记--第三章(2)推荐系统中的EE问题