\documentclass[12pt, UTF8, a4paper, fontset=none, openany]{ctexbook}
\usepackage{geometry}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{amssymb}
\usepackage{bm}
\usepackage{graphicx}
\usepackage[colorlinks, linkcolor=black, anchorcolor=green, citecolor=blue]{hyperref}
\usepackage{mathrsfs}
\usepackage[inline]{enumitem}
\usepackage{float}
\usepackage{emptypage}
\usepackage{multicol}
\usepackage{float}
\usepackage{tikz}
\usepackage{wrapfig}
\usepackage{nicematrix}
\usepackage{subfig}
\usetikzlibrary{calc}
\usetikzlibrary{arrows.meta}

\geometry{a4paper,scale=0.8}

\defaultCJKfontfeatures{Mapping = fullwidth-stop}
\ctexset{fontset=macnew}
% \ctexset{fontset=windows} % On Windows

\allowdisplaybreaks[2]

\newtheorem{theorem}{定理}[section]
\newtheorem{axiom}{公理}[section]
\newtheorem{definition}{定义}[section]
\newtheorem{lemma}{引理}[section]
\newtheorem{corollary}{推论}[section]
\newtheorem*{corollary*}{推论}
\newtheorem{example}{例}[section]
\newtheorem{proposition}{命题}[section]
\newtheorem*{remark}{注}

\DeclareMathOperator{\lcm}{lcm}

% \renewcommand{\qedsymbol}{} %去掉证明结尾的方框

\newcommand{\newnoun}[2]{\textbf{#1}（\textit{#2}）}
\newcommand{\dif}{\mathop{}\!\mathrm{d}}
\newcommand{\eqco}{\text{，}} % Chinese comma in equation
\newcommand{\eqper}{\text{。}} % Chinese period in equation
\newcommand{\toinf}{\lim \limits_{n \to \infty}}
\newcommand{\setcom}[1]{{#1}^\mathrm{C}} % Complement Set
\newcommand{\realnum}{\mathbb{R}}
\newcommand{\integer}{\mathbb{Z}}
\newcommand{\naturalnum}{\mathbb{N}}

\title{{\Huge{\textbf{离散数学}}}}
\author{}
\date{}
% linespread{1.5}
% \includeonly{12EulersFormula.tex}

\begin{document}
    \maketitle
    \cleardoublepage
    \pagenumbering{roman}
    \setcounter{page}{1}
    \tableofcontents
    \cleardoublepage
    \setcounter{page}{1}
    \pagenumbering{arabic}
    \include{01LetsCount.tex}
    \include{02CombinatorialTools.tex}
    \include{03Binome.tex}
    \include{04FibonacciNumbers.tex}
    \include{05CombinatorialProbability.tex}
    \include{06IntergersDivisorsAndPrimes.tex}
    \include{07Graphs.tex}
    \include{08Trees.tex}
    \include{09FindingTheOptimum.tex}
    \include{10MatchingsInGraphs.tex}
    \include{11CombinatoricsInGeometry.tex}
    \include{12EulersFormula.tex}
\end{document}