%article basic

%纸张设置
\usepackage[top=1.2in,bottom=1.2in,left=1.2in,right=1in]{geometry}

%基本宏包
\usepackage[boldfont,slantfont,CJKnumber]{xeCJK}
\usepackage{indentfirst,CJKfntef} %缩进和修饰
\usepackage[colorlinks,linkcolor=black,xetex]{hyperref} %生成书签

%设置中文字体
\setCJKmainfont[BoldFont=SimHei,ItalicFont=KaiTi_GB2312]{SimSun}
%\setCJKmonofont[BoldFont=SimHei,ItalicFont=KaiTi_GB2312]{SimSun}
%\setCJKsansfont[BoldFont=SimHei,ItalicFont=KaiTi_GB2312]{Comic Sans MS}

%\setmainfont[BoldFont=SimHei,ItalicFont=KaiTi_GB2312]{Times New Roman}
%\setmonofont[BoldFont=SimHei,ItalicFont=KaiTi_GB2312]{SimSun}
%\setsansfont{Times New Roman}

%缩进及断行
\AtBeginDocument{
\parindent 2em
}

%设置行距
%\renewcommand{\baselinestretch}{1.38}
%\renewcommand{\baselinestretch}{1.2}

%标题样式
\usepackage[center,pagestyles]{titlesec}
\titleformat{\section}{\bfseries}{\S\,\thesection}{1em}{}
\titleformat{\subsection}{\it}{\S\,\thesubsection}{1em}{}

%\newpagestyle{main}{
%\sethead{\small\S\,\thesection\quad\sectiontitle}{}{$\cdot$~\thepage~$\cdot$}
%\setfoot{}{}{}\headrule}
%\pagestyle{main}

%定义字号
\newcommand{\wuhao}{\fontsize{10.5pt}{12.6pt}\selectfont}        %% 五号字体
\newcommand{\xiaosi}{\fontsize{12pt}{18pt}\selectfont}           %% 小四字体
\newcommand{\sihao}{\fontsize{14pt}{21pt}\selectfont}            %% 四号字体
\newcommand{\xiaosan}{\fontsize{15pt}{22.5pt}\selectfont}        %% 小三字体
\newcommand{\sanhao}{\fontsize{16pt}{24pt}\selectfont}           %% 三号字体
\newcommand{\xiaoer}{\fontsize{18pt}{27pt}\selectfont}           %% 小二字体
\newcommand{\erhao}{\fontsize{21pt}{30pt}\selectfont}            %% 二号字体
 

*************************************************************************************************************

%Math Basic

\usepackage{amsmath,amsthm} %常用数学宏包

%重定义证明环境
\makeatletter
\renewenvironment{proof}[1][\proofname]{\par
    \pushQED{\qed}%
    \normalfont \topsep6\p@\@plus6\p@ \labelsep1em\relax
    \trivlist
    \item[\hskip\labelsep\indent
        \bfseries #1]\ignorespaces
}{%
    \popQED\endtrivlist\@endpefalse
}
\makeatother
\renewcommand{\proofname}{\bf{证明}}

%重定义定理环境
\makeatletter
\def\@thm#1#2#3{%
  \ifhmode\unskip\unskip\par\fi
  \normalfont
  \trivlist
  \let\thmheadnl\relax
  \let\thm@swap\@gobble
  \thm@notefont{\fontseries\mddefault\upshape}%
  \thm@headpunct{}% add period after heading
  \thm@headsep 5\p@ plus\p@ minus\p@\relax
  \thm@space@setup
  #1% style overrides
  \@topsep \thm@preskip               % used by thm head
  \@topsepadd \thm@postskip           % used by \@endparenv
  \def\@tempa{#2}\ifx\@empty\@tempa
    \def\@tempa{\@oparg{\@begintheorem{#3}{}}[]}%
  \else
    \refstepcounter{#2}%
    \def\@tempa{\@oparg{\@begintheorem{#3}{\csname the#2\endcsname}}[]}%
  \fi
  \@tempa
}
\makeatother

\newtheorem{theorem}{{\rule{1.5em}{0ex} 定理}~}
\newtheorem{proposition}{{\rule{1.5em}{0ex} 命题}~}
\newtheorem{lemma}{{\rule{1.5em}{0ex} 引理}~}
\newtheorem{corollary}{{\rule{1.5em}{0ex} 推论}~}[theorem]
\newtheorem{definition}{{\rule{1.5em}{0ex} 定义}~}
\newtheorem{example}{{\rule{1.5em}{0ex} 例}~}

\newcommand{\ud}{\mathrm{d}} %正体d,用于积分

%公式编号
\renewcommand{\theequation}{\arabic{section}.\arabic{equation}}
\numberwithin{equation}{section}