fix dates

* 重要改动：提供了一个定义定理类环境的命令 \elegantnewtheorem；
* 重要改动：为所有内置定理类环境提供了带星号的版本，带星号的定理类环境不会编号；fix #167
* 将 TeX Gyre Termes 改为 TeX Gyre TermesX，使英文部分字形与 newtx
  系列宏包更相近；
* 重写了内置定理类环境的实现方法。

.gitignore

@@ -0,0 +1,247 @@
+## Core latex/pdflatex auxiliary files:
+*.aux
+*.lof
+*.log
+*.lot
+*.fls
+*.out
+*.toc
+*.fmt
+*.fot
+*.cb
+*.cb2
+.*.lb
+.DS_Store
+clean.bat
+elegant*-cn.pdf
+elegant*-en.pdf
+*.dates
+
+## Intermediate documents:
+*.dvi
+*.xdv
+*-converted-to.*
+# these rules might exclude image files for figures etc.
+# *.ps
+# *.eps
+# *.pdf
+
+## Generated if empty string is given at "Please type another file name for output:"
+.pdf
+
+## Bibliography auxiliary files (bibtex/biblatex/biber):
+*.bbl
+*.bcf
+*.blg
+*-blx.aux
+*-blx.bib
+*.run.xml
+
+## Build tool auxiliary files:
+*.fdb_latexmk
+*.synctex
+*.synctex(busy)
+*.synctex.gz
+*.synctex.gz(busy)
+*.pdfsync
+
+## Auxiliary and intermediate files from other packages:
+# algorithms
+*.alg
+*.loa
+
+# achemso
+acs-*.bib
+
+# amsthm
+*.thm
+
+# beamer
+*.nav
+*.pre
+*.snm
+*.vrb
+
+# changes
+*.soc
+
+# cprotect
+*.cpt
+
+# elsarticle (documentclass of Elsevier journals)
+*.spl
+
+# endnotes
+*.ent
+
+# fixme
+*.lox
+
+# feynmf/feynmp
+*.mf
+*.mp
+*.t[1-9]
+*.t[1-9][0-9]
+*.tfm
+
+#(r)(e)ledmac/(r)(e)ledpar
+*.end
+*.?end
+*.[1-9]
+*.[1-9][0-9]
+*.[1-9][0-9][0-9]
+*.[1-9]R
+*.[1-9][0-9]R
+*.[1-9][0-9][0-9]R
+*.eledsec[1-9]
+*.eledsec[1-9]R
+*.eledsec[1-9][0-9]
+*.eledsec[1-9][0-9]R
+*.eledsec[1-9][0-9][0-9]
+*.eledsec[1-9][0-9][0-9]R
+
+# glossaries
+*.acn
+*.acr
+*.glg
+*.glo
+*.gls
+*.glsdefs
+
+# gnuplottex
+*-gnuplottex-*
+
+# gregoriotex
+*.gaux
+*.gtex
+
+# htlatex
+*.4ct
+*.4tc
+*.idv
+*.lg
+*.trc
+*.xref
+
+# hyperref
+*.brf
+
+# knitr
+*-concordance.tex
+# TODO Comment the next line if you want to keep your tikz graphics files
+*.tikz
+*-tikzDictionary
+
+# listings
+*.lol
+
+# makeidx
+*.idx
+*.ilg
+*.ind
+*.ist
+
+# minitoc
+*.maf
+*.mlf
+*.mlt
+*.mtc[0-9]*
+*.slf[0-9]*
+*.slt[0-9]*
+*.stc[0-9]*
+
+# minted
+_minted*
+*.pyg
+
+# morewrites
+*.mw
+
+# nomencl
+*.nlg
+*.nlo
+*.nls
+
+# pax
+*.pax
+
+# pdfpcnotes
+*.pdfpc
+
+# sagetex
+*.sagetex.sage
+*.sagetex.py
+*.sagetex.scmd
+
+# scrwfile
+*.wrt
+
+# sympy
+*.sout
+*.sympy
+sympy-plots-for-*.tex/
+
+# pdfcomment
+*.upa
+*.upb
+
+# pythontex
+*.pytxcode
+pythontex-files-*/
+
+# thmtools
+*.loe
+
+# TikZ & PGF
+*.dpth
+*.md5
+*.auxlock
+
+# todonotes
+*.tdo
+
+# easy-todo
+*.lod
+
+# xmpincl
+*.xmpi
+
+# xindy
+*.xdy
+
+# xypic precompiled matrices
+*.xyc
+
+# endfloat
+*.ttt
+*.fff
+
+# Latexian
+TSWLatexianTemp*
+
+## Editors:
+# WinEdt
+*.bak
+*.sav
+
+# Texpad
+.texpadtmp
+
+# Kile
+*.backup
+
+# KBibTeX
+*~[0-9]*
+
+# auto folder when using emacs and auctex
+./auto/*
+*.el
+
+# expex forward references with \gathertags
+*-tags.tex
+
+# standalone packages
+*.sta
+
+# generated if using elsarticle.cls
+*.spl

License

@@ -0,0 +1,416 @@
+The LaTeX Project Public License
+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+
+LPPL Version 1.3c  2008-05-04
+
+Copyright 1999 2002-2008 LaTeX3 Project
+    Everyone is allowed to distribute verbatim copies of this
+    license document, but modification of it is not allowed.
+
+
+PREAMBLE
+========
+
+The LaTeX Project Public License (LPPL) is the primary license under
+which the LaTeX kernel and the base LaTeX packages are distributed.
+
+You may use this license for any work of which you hold the copyright
+and which you wish to distribute.  This license may be particularly
+suitable if your work is TeX-related (such as a LaTeX package), but 
+it is written in such a way that you can use it even if your work is 
+unrelated to TeX.
+
+The section `WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE',
+below, gives instructions, examples, and recommendations for authors
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+WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE
+======================================================
+
+This section contains important instructions, examples, and
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+
+Choosing This License or Another License
+----------------------------------------
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+Here is an example of such a notice and statement:
+
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+Given such a notice and statement in a file, the conditions
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+Derived Works That Are Not Replacements
+---------------------------------------
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+
+Important Recommendations
+-------------------------
+
+ Defining What Constitutes the Work
+
+   The LPPL requires that distributions of the Work contain all the
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+   This could, for example, be achieved by explicitly listing all the
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+   in that place.  In the absence of an unequivocal list it might be
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+   entitled to make reasonable conjectures as to which files comprise
+   the Work.
+

README.md

@@ -0,0 +1,37 @@
+<!-- Author : Dongsheng Deng & Liam Huang-->
+<!-- Program Email: elegantlatex2e@gmail.com -->
+
+[Homepage](https://elegantlatex.org/) | [Github](https://github.com/ElegantLaTeX/ElegantBook) | [CTAN](https://ctan.org/pkg/elegantbook) | [Download](https://github.com/ElegantLaTeX/ElegantBook/releases) | 
+
+![License](https://img.shields.io/ctan/l/elegantbook.svg) ![CTAN Version](https://img.shields.io/ctan/v/elegantbook.svg) ![Github Version](https://img.shields.io/github/release/ElegantLaTeX/ElegantBook.svg) ![Repo Size](https://img.shields.io/github/repo-size/ElegantLaTeX/ElegantBook.svg)
+
+-------
+
+# ElegantBook: 优美的 LaTeX 书籍模板 An Elegant LaTeX Template for Books 
+
+ElegantBook 是为 LaTeX 书籍写作而设计的模板，由 [Ethan Deng](https://github.com/EthanDeng) 和 [Liam Huang](https://github.com/Liam0205) 创立，现在主要由 [Ethan Deng](https://github.com/EthanDeng)、[乙醇](https://github.com/syvshc)和[死抠](https://github.com/sikouhjw)维护。如果你有其他问题、建议或者报告 bug，可以提交 issues 或者加入我们的 QQ 用户交流群：692108391。
+
+ElegantBook is designed for writing books, created by [Ethan Deng](https://github.com/EthanDeng) and [Liam Huang](https://github.com/Liam0205), and maintained by [Ethan Deng](https://github.com/EthanDeng), [syvshc](https://github.com/syvshc) and [sikouhjw](https://github.com/sikouhjw). Just enjoy it! If you have any questions, suggestions or bug reports, you can create issues or contact us at elegantlatex2e@gmail.com.
+
+
+## 致谢 Acknowledgement
+
+
+特别感谢 [sikouhjw](https://github.com/sikouhjw) 和 [syvshc](https://github.com/syvshc) 长期以来对于 Github 上 issue 的快速回应，以及各个社区论坛对于 ElegantLaTeX 相关问题的回复。特别感谢 ChinaTeX 以及 [LaTeX 工作室](http://www.latexstudio.net/)对于本系列模板的大力宣传与推广。
+
+Thank [sikouhjw](https://github.com/sikouhjw) and [syvshc](https://github.com/syvshc) for their quick response to Github issues and continuously support work for ElegantLaTeX community. Thank ChinaTeX and [LaTeX Studio](http://www.latexstudio.net/) for their promotion. 
+
+
+## 协议 License
+
+本模板发布遵循 LaTeX 项目公共许可证 1.3 c 或更高版本。
+如果是衍生作品，请务必加入协议声明和模板信息（github、CTAN 地址）。
+
+This work is released under the LaTeX Project Public License, v1.3c or later.
+
+
+## 衍生品 Derivative Works
+
++ [ElegantBookdown](https://github.com/XiangyunHuang/ElegantBookdown)：[XiangyunHuang](https://github.com/XiangyunHuang) 开发并维护的基于 ElegantBook 的 Bookdown 模板。
++ [bookdownplus](https://github.com/pzhaonet/bookdownplus)：应网友要求，[pzhaonet](https://github.com/pzhaonet) 在 bookdownplus 收录了 ElegantPaper 模板，并为 Mac 做了字体适配。
++ [PanBook](https://github.com/annProg/PanBook)：[annProg](https://github.com/annProg) 开发并维护的基于 Markdown 写作的工作流，收录了 ElegantBook 和 ElegantPaper 模板。

base.tex

@@ -1,34 +0,0 @@
-
-%% tikz setting
-\tikzset{x=1pt,y=1pt}
-\tikzset{elegant/.style={fill=main,draw=main},
-             null/.style={fill=white,draw=none}}
-             
-%% the triangle shape
-\newcommand{\triz}[2]{
-\begin{scope}[xshift=#1,rotate=#2]
-  \draw[elegant] (0,0) -- (105,6) .. controls (119,21) and (132,13) .. (135,12) .. controls (124,15) and (110,8) .. (107,-12) -- cycle;
-  \draw[null] (40,-0.5) -- (101,-4) -- (103,1)--cycle;
-\end{scope}
-}
-
-%% the ellipse shape +127
-\newcommand{\ellz}[1]{
-\begin{scope}[xshift=#1,yshift=3]
-\draw[elegant,rotate around={60:(0,-3)}](0,-3) ellipse (10.5 and 8.5);
-\draw[null](-3,-10) .. controls (-10,-6)  and (-2,6) .. (4.5,4) .. controls (0,3) and  (-4,-6) .. (-3,-10)--cycle;
-\end{scope}
-}
-
-%% the integration shape+147
-\newcommand{\intz}[1]{
-\begin{scope}[xshift=#1,yshift=2]
-\draw[elegant,draw=none,very thin] (-31,-14.5) .. controls (-17,-21)  and (-9,-8) .. (-3,0) .. controls (10,19) and (22,17) .. (29,9) .. controls (21,13) and (13,13) .. (3,-1) .. controls (-4,-11) and (-18,-27) .. (-31,-14.5) -- cycle ;
-\end{scope}
-}
-
-
-
-
-
-

elegantbook-en.tex

@@ -0,0 +1,797 @@
+\documentclass[11pt]{elegantbook}
+
+\title{An Elegant \LaTeX{} Template for Books}
+\subtitle{Classic Elegant\LaTeX{} Template}
+
+\author{Ethan Deng \& Liam Huang}
+\institute{Elegant\LaTeX{} Program}
+\date{Aug 15, 2022}
+\version{4.4}
+\bioinfo{Bio}{Information}
+
+\extrainfo{Victory won\rq t come to us unless we go to it. }
+
+\logo{logo-blue.png}
+\cover{cover.jpg}
+
+% modify the color in the middle of titlepage
+\definecolor{customcolor}{RGB}{32,178,170}
+\colorlet{coverlinecolor}{customcolor}
+\usepackage{cprotect}
+
+\addbibresource[location=local]{reference.bib} % bib
+
+\begin{document}
+
+\maketitle
+
+\frontmatter
+\tableofcontents
+
+\mainmatter
+
+\chapter{Elegant\LaTeX{} Templates}
+Elegant\LaTeX{} Program developers are intended to provide you beautiful, elegant, user-friendly templates. Currently, the Elegant\LaTeX{} is composed of \href{https://github.com/ElegantLaTeX/ElegantNote}{ElegantNote}, \href{https://github.com/ElegantLaTeX/ElegantBook}{ElegantBook}, \href{https://github.com/ElegantLaTeX/ElegantPaper}{ElegantPaper}, designed for typesetting notes, books, and working papers respectively. Latest releases are strongly recommended! This guide is aimed at briefly introducing the 101 of this template. For any other question, suggestion or comment, feel free to contact us on GitHub \href{https://github.com/ElegantLaTeX/ElegantBook/issues}{issues} or email us at \email{elegantlatex2e@gmail.com}.
+
+Contact Infos:
+\begin{itemize}
+  \item GitHub: \href{https://github.com/ElegantLaTeX/}{https://github.com/ElegantLaTeX/}
+  \item CTAN: \href{https://ctan.org/pkg/elegantbook}{https://ctan.org/pkg/elegantbook}
+  \item Download: \href{https://github.com/ElegantLaTeX/ElegantBook/releases}{release}, \href{https://github.com/ElegantLaTeX/ElegantBook/archive/master.zip}{latest version}
+\end{itemize}
+
+
+\section{Online Usage}
+You can visit \href{https://www.overleaf.com/}{Overleaf} to use our template online anywhere and anytime without local installation. To find our template, search \lstinline{elegantlatex} in the \lstinline{templates} or simply visit \href{https://www.overleaf.com/latex/templates?addsearch=elegantlatex}{search result}, choose the template you prefer and \lstinline{Open as Template} to own a copy yourself to edit freely. To learn more about Overleaf, please refer to \href{https://www.overleaf.com/learn}{Documentation}.
+
+
+\section{Portable Version}
+For portable version, simply download lastest ElegantBook-master from GitHub or CTAN (to be more accurate, download \lstinline{elegantbook.cls}) and save the file(s) under your working directory. This way of installation is simple and convenient, but you have to manually update \lstinline{cls} now and then.
+
+
+\section{Update Templates}
+You can use cmd/terminal to update the tlmgr itself and all the packages, the commands are:
+\begin{lstlisting}
+tlmgr update --self
+tlmgr update --all
+\end{lstlisting}
+
+To learn more, please refer to \href{https://tex.stackexchange.com/questions/55437/how-do-i-update-my-tex-distribution}{How do I update my \TeX{} distribution?}
+
+\section{Other Release Versions}
+If you are a \TeX{} Live 2018/2019/2020/2021 user and would like to update, the official solution is to uninstall the previous version. If you want to save the bother of uninstallation and re-installation, please copy \lstinline{elegantbook.cls} to the installation directory of \TeX{} Live 2022 (default: \lstinline|C:\texlive\2022\texmf-dist\tex\latex\elegantbook| ), run \lstinline{texhash} in cmd.
+
+\chapter{ElegantBook Settings}
+This template is based on the Standard \LaTeX{} book class, so the options of book class work as well (Note that the option of papersize has no effect due to \lstinline{device} option). The default encoding is UTF-8 while \TeX{} Live is recommended. The test environments are Win10/Ubuntu 20.04/macOS + \TeX{} Live 2022/ Mac\TeX{} 2022, either \hologo{pdfLaTeX} or \hologo{XeLaTeX} works fine for \lstinline{lang=en}.
+
+\section{Languages}
+We defined one option named \lstinline{lang} which has two basic values, \lstinline{lang=en} (default) , \lstinline{lang=cn}. Different values will alter the captions of figure/table, abstract name, refname, etc. You can use this option as
+
+\begin{lstlisting}
+\documentclass[en]{elegantbook} 
+\documentclass[lang=en]{elegantbook}
+\end{lstlisting}
+
+Besides the two basic language translation, our user provide more options, here is a short brief introduction to these translation. Since I am not familiar with these languages, I can't guarantee that the translations are correct, please comment on GitHub if you have some questions.
+
+\begin{itemize}
+  \item Italian translation \lstinline{lang=it}, provided by \href{https://github.com/VincentMVV}{VincentMVV} , please refer to \href{https://github.com/ElegantLaTeX/ElegantBook/issues/85}{Italian translation};
+  \item French translation \lstinline{lang=fr}, provided by \href{https://github.com/abfek66}{abfek66} , please refer to \href{https://github.com/ElegantLaTeX/ElegantBook/issues/85}{Italian translation};
+  \item Dutch Translation \lstinline{lang=nl}, provided by \href{https://github.com/inktvis75}{inktvis75} , please refer to \href{https://github.com/ElegantLaTeX/ElegantBook/issues/108}{Dutch Translation};
+  \item Hungarian translation \lstinline{lang=hu}, provided by \href{https://github.com/palkotamas}{palkotamas}, please refer to \href{https://github.com/ElegantLaTeX/ElegantBook/issues/111}{Hungarian translation};
+  \item Deutsch translation \lstinline{lang=de}, provided by Lisa, please refer to \href{https://github.com/ElegantLaTeX/ElegantBook/issues/113}{Deutsch translation};
+  \item Spanish translation \lstinline{lang=es}, provided by Gustavo A. Corradi, please refer to \href{https://github.com/ElegantLaTeX/ElegantBook/issues/133}{Spanish translation};
+  \item Mongolian translation \lstinline{lang=mn}, provided by \href{https://github.com/Altantsooj}{Altantsooj}, please refer to \href{https://github.com/ElegantLaTeX/ElegantBook/issues/137}{Mongolian translation};
+  \item Japanese translation \lstinline{lang=jp}, provided by \href{https://github.com/inusturbo}{inusturbo}, please refer to \href{https://github.com/ElegantLaTeX/ElegantBook/issues/172}{Japanese translation}.
+\end{itemize}
+
+\begin{remark}
+Chinese Characters  are acceptable \textbf{ONLY} in \lstinline{lang=cn}.
+\end{remark}
+
+\section{Device Mode Option}
+The option for device (\lstinline{device}) was originally used in ElegantNote, now we include this option in ElegantBook\footnote{Pictures have to be modified accordingly.} as well. Activate iPad mode in the following way\footnote{Default size: normal, A4 paper.}:
+\begin{lstlisting}
+\documentclass[pad]{elegantbook} %or
+\documentclass[device=pad]{elegantbook}
+\end{lstlisting}
+
+\section{Color Themes}
+This template contains 5 color themes, i.e., \textcolor{structure1}{\lstinline{green}}\footnote{Original default theme.}, \textcolor{structure2}{\lstinline{cyan}}, \textcolor{structure3}{\lstinline{blue}}(default), \textcolor{structure4}{\lstinline{gray}}, \textcolor{structure5}{\lstinline{black}}. You can choose \lstinline{green} with
+\begin{lstlisting}
+\documentclass[green]{elegantbook} %or
+\documentclass[color=green]{elegantbook}
+\end{lstlisting}
+
+
+\begin{table}[htbp]
+\caption{ElegantBook Themes\label{tab:color thm}}
+\centering
+\begin{tabular}{ccccccc}
+\toprule
+          & \textcolor{structure1}{green} 
+          & \textcolor{structure2}{cyan} 
+          & \textcolor{structure3}{blue}
+          & \textcolor{structure4}{gray} 
+          & \textcolor{structure5}{black} 
+          & Main Environments\\
+\midrule
+structure & \makecell{{\color{structure1}\rule{1cm}{1cm}}}
+        & \makecell{{\color{structure2}\rule{1cm}{1cm}}}
+        & \makecell{{\color{structure3}\rule{1cm}{1cm}}} 
+        & \makecell{{\color{structure4}\rule{1cm}{1cm}}} 
+        & \makecell{{\color{structure5}\rule{1cm}{1cm}}} 
+        & chapter  section  subsection \\
+main      & \makecell{{\color{main1}\rule{1cm}{1cm}}}
+        & \makecell{{\color{main2}\rule{1cm}{1cm}}}
+        & \makecell{{\color{main3}\rule{1cm}{1cm}}}
+        & \makecell{{\color{main4}\rule{1cm}{1cm}}}
+        & \makecell{{\color{main5}\rule{1cm}{1cm}}}
+        & definition  exercise  problem  \\
+second    & \makecell{{\color{second1}\rule{1cm}{1cm}}}
+        & \makecell{{\color{second2}\rule{1cm}{1cm}}}
+        & \makecell{{\color{second3}\rule{1cm}{1cm}}}
+        & \makecell{{\color{second4}\rule{1cm}{1cm}}}
+        & \makecell{{\color{second5}\rule{1cm}{1cm}}}
+        & theorem  lemma  corollary\\
+third     & \makecell{{\color{third1}\rule{1cm}{1cm}}}
+        & \makecell{{\color{third2}\rule{1cm}{1cm}}}
+        & \makecell{{\color{third3}\rule{1cm}{1cm}}}
+        & \makecell{{\color{third4}\rule{1cm}{1cm}}}
+        & \makecell{{\color{third5}\rule{1cm}{1cm}}}
+        & proposition\\
+\bottomrule
+\end{tabular}
+\end{table}
+
+If you want to customize the colors, please select \lstinline{nocolor} or use \lstinline{color=none} and declare the main, second, and third colors in the preamble section as follows:
+\begin{lstlisting}[frame=single]
+\definecolor{structurecolor}{RGB}{60,113,183}
+\definecolor{main}{RGB}{0,166,82}%
+\definecolor{second}{RGB}{255,134,24}%
+\definecolor{third}{RGB}{0,174,247}% 
+\end{lstlisting}
+
+\section{Cover}
+\subsection{Customized Cover}
+From v3.10, customized cover is allowed, you can choose or hide any element as you prefer. Current optional elements are:
+\begin{itemize}
+  \item title: \lstinline{\title}
+  \item subtitle: \lstinline{\subtitle}
+  \item author: \lstinline{\author}
+  \item institute: \lstinline{\institute}
+  \item date: \lstinline{\date}
+  \item version: \lstinline{\version}
+  \item extra information: \lstinline{\extrainfo}
+  \item cover image: \lstinline{\cover}
+  \item logo: \lstinline{\logo}
+\end{itemize}
+
+Besides, an extra command \lstinline{\bioinfo} is provided with two options--caption and content. For instance, if you want to display \lstinline{Username: 111520}, just type in
+
+\begin{lstlisting}
+\bioinfo{Username}{115520}
+\end{lstlisting}
+
+You can change the color of the horizontal bar of the cover by
+\begin{lstlisting}
+  \definecolor{customcolor}{RGB}{32,178,170}
+  \colorlet{coverlinecolor}{customcolor}
+\end{lstlisting}
+
+\subsection{Cover Image}
+The cover image used in this template is from \href{https://pixabay.com/en/tea-time-poetry-coffee-reading-3240766/}{pixabay.com}. The image is completely free and can be used under any circumstance. The cover image size is $1280 \times 1024$. If you would like to change the cover, please crop it according to the size of the cover picture strictly. One free online image clipping site: \href{https://www.fotor.com/cn}{fotor.com}. Feel free to join our QQ Group to get more elegant covers.
+
+\subsection{Logo}
+Aspect ratio of the logo is 1:1 in this guide, i.e. a square picture. To replace the logo, do remember to choose the appropriate picture.
+
+\subsection{Stylized Cover}
+Want to use stylized cover?(For instance, A4-sized PDF designed by Adobe Illustrator) Please comment out \lstinline{\maketitle} and use \lstinline{pdfpages} to insert the cover. Similar for using \lstinline{titlepage}. If you would like to use the cover in version 2.x, please refer to \href{https://github.com/EthanDeng/etitlepage}{etitlepage}.
+
+\section{Chapter Title Display Styles}
+
+This template contains 2 sets of \textit{title display styles},\lstinline{hang}(default) and \lstinline{display} style. For the former, chapter title is displayed on a single line (\lstinline{hang}). For the latter, chapter title is displayed on a double line (\lstinline{display}).In this guide, we use \lstinline{hang} . To change display style, use:
+\begin{lstlisting}
+\documentclass[hang]{elegantbook} %or
+\documentclass[titlestyle=hang]{elegantbook}
+\end{lstlisting}
+
+
+\section{Introduction of Math Environments}
+We defined two sets of theorem modes, \lstinline{simple} style and \lstinline{fancy} style (default). You may change to \lstinline{simple} mode by
+
+\begin{lstlisting}
+\documentclass[simple]{elegantbook} %or
+\documentclass[mode=simple]{elegantbook}
+\end{lstlisting}
+
+In this template, we defined four different theorem class environments
+
+\begin{itemize}
+\item \textit{Theorem Environments}, including title and content, numbering corresponding to chapter. Three types depending on the format:
+   \begin{itemize}
+      \item \textcolor{main}{\textbf{definition}} environment, the color is  \textcolor{main}{main};
+      \item \textcolor{second}{\textbf{theorem, lemma, corollary, axiom, postulate}} environment, the color is \textcolor{second} {second};
+      \item \textcolor{third}{\textbf{proposition}} environment, the color is \textcolor{third}{third}.
+   \end{itemize}
+\item \textit{Example Environment}, including \textbf{example, exercise, problem} environment, auto numbering according to chapter.
+\item \textit{Proof Environment}, including \textbf{proof, note} environment containing introductory symbol (\textbf{note} environment) or ending symbol (\textbf{proof} environment).
+\item \textit{Conclusion Environment}, including \textbf{conclusion, assumption, property, remark and solution}\footnote{We also define an option \lstinline{result}, which can hide the \lstinline{solution} and \lstinline{proof} environments. You can switch between \lstinline{result=answer} and \lstinline{result=noanswer}.} environments, all of which begin with boldfaced words, with format consistent with normal paragraphs.
+\end{itemize}
+
+All of theorem environments have star versions: \textcolor{main}{\textbf{definition*}}, \textcolor{second}{\textbf{theorem*}}, \textcolor{second}{\textbf{lemma*}}, \textcolor{second}{\textbf{corollary*}}, \textcolor{second}{\textbf{axiom*}}, \textcolor{second}{\textbf{postulate*}}, \textcolor{third}{\textbf{proposition*}}. Environments with an asterisk are not numbered.
+
+\subsection{Theorem Class Environments}
+
+\subsubsection{\lstinline{fancy} mode}
+
+In \lstinline{fancy} mode, the template uses the \lstinline{tcolorbox} package to customize the theorem class environments, it is slightly different from the normal theorem environments. The usage is as follows:
+\begin{lstlisting}
+  % name + label
+  \begin{theorem}{theorem name}{label}
+    The content of a theorem with name and label. 
+    Use \ref{thm:label} to refer this theorem.
+  \end{theorem}
+  % no name + label
+  \begin{theorem}{}{label no name}
+    The content of a theorem without name.
+    Use \ref{thm:label no name} to refer this theorem.
+  \end{theorem}
+  % name + no label
+  \begin{theorem}{theorem name}{}
+    The content of a theorem without label.
+    Can't refer this theorem.
+    The last {} can be removed.
+  \end{theorem}
+  % no name + no label
+  \begin{theorem}{}{}
+    The content of a theorem without name and label.
+    Can't refer this theorem.
+    Both of {} can be removed.
+  \end{theorem}
+  \end{lstlisting}
+
+The first parameter \lstinline{theorem name} represents the name of the theorem. If the current theorem has no name, please use \lstinline|{}|\cprotect\footnote{Unless this theorem has neither no label, you should not omit this \verb|{}|.}, and the second parameter \lstinline{label} represents the label used in cross-reference with \verb|\ref{thm:label}|. Note that cross-references must be prefixed with \lstinline{thm:}. 
+
+Other theorem class environments with the same usage includes:
+
+\begin{table}[htbp]
+\centering
+\caption{Theorem Class Environments}
+  \begin{tabular}{llll}
+  \toprule
+  Environment & Label text & Prefix & Cross-reference \\
+  \midrule
+  definition & label & def   & \lstinline|\ref{def:label}| \\
+  theorem & label & thm   & \lstinline|\ref{thm:label}| \\
+  postulate & label & pos & \lstinline|\ref{pos:label}| \\
+  axiom & label & axi & \lstinline|\ref{axi:label}|\\
+  lemma & label & lem   & \lstinline|\ref{lem:label}| \\
+  corrlary & label & cor   & \lstinline|\ref{cor:label}| \\
+  proposition & label & pro   & \lstinline|\ref{pro:label}| \\
+  \bottomrule
+  \end{tabular}%
+\label{tab:theorem-class}%
+\end{table}%
+
+From version 4.1, you can write your theorem environments as follows:
+\begin{lstlisting}
+\begin{theorem}[theorem name]\label{thm:theorem-label}
+  The content of theorem.
+\end{theorem}
+% or
+\begin{theorem}\label{thm:theorem-without-name}
+  The content of theorem.
+\end{theorem}
+\end{lstlisting}
+
+In this case, cross-reference don't have to be prefixed, i.e. the parameter of \lstinline{\ref} is the same as that of \lstinline{\label}.
+ 
+\subsubsection{\lstinline{simple} mode}
+
+In \lstinline{simple} mode, the template uses the \lstinline{amsthm} package to customize the theorem class environments. The usage is as follows:
+
+\begin{lstlisting}
+\begin{theorem}[theorem name]\label{thm:theorem-label}
+  The content of theorem.
+\end{theorem}
+% or 
+\begin{theorem}\label{thm:theorem-without-name}
+  The content of theorem without name.
+\end{theorem}
+\end{lstlisting}
+
+\subsection{Counter for Theorem Environments}
+
+You can use \lstinline{thmcnt} option to control the theorem counter/number display style for the theorem environments, the acceptable options are \lstinline{chapter} (default) and \lstinline{section}:
+
+\begin{lstlisting}
+\documentclass[section]{elegantbook} % turn the Theorem 4.1 to Theorem 4.1.1 
+\documentclass[thmcnt=section]{elegantbook}
+\end{lstlisting}
+
+
+\subsection{Other Customized Environments}
+The other three math environments can be called directly since there are no additional option for them, e.g. \lstinline{example}:
+\begin{lstlisting}
+\begin{example}
+This is the content of example environment.
+\end{example}
+\end{lstlisting}
+
+The effect is as follows:
+
+\begin{example}
+This is the content of example environment.
+\end{example}
+
+These are all similar environments with slight differences lies in:
+
+\begin{itemize}
+   \item Example, exercise, problem environments number within chapter;
+   \item Note begins with introductory symbol and proof ends with ending symbol;
+   \item Conclusion and other environments are normal paragraph environments with boldfaced introductory words.
+\end{itemize}
+
+
+\section{List Environments}
+This template uses \lstinline{tikz} to customize the list environments, with \lstinline{itemize} environment customized to the third depth and \lstinline{enumerate} environment customized to fourth depth. The effect is as follows\\[2ex]
+\begin{minipage}[b]{0.49\textwidth}
+\begin{itemize}
+   \item first item of nesti;
+   \item second item of nesti;
+   \begin{itemize}
+      \item first item of nestii;
+      \item second item of nestii;
+      \begin{itemize}
+         \item first item of nestiii;
+         \item second item of nestiii.
+      \end{itemize}   
+   \end{itemize}
+\end{itemize}
+\end{minipage}
+\begin{minipage}[b]{0.49\textwidth}
+\begin{enumerate}
+   \item first item of nesti;
+   \item second item of nesti;
+   \begin{enumerate}
+      \item first item of nestii;
+      \item second item of nestii;
+      \begin{enumerate}
+         \item first item of nestiii;
+         \item second item of nestiii.
+      \end{enumerate}   
+   \end{enumerate}
+\end{enumerate}
+\end{minipage}
+
+
+\section{Fonts}
+\textcolor{red}{\bfseries Alert} After v3.10, newtx is reset to cm, together with other two options, the \lstinline{math} font option offers:
+\begin{enumerate}
+  \item \lstinline{math=cm}(default), use \LaTeX{} default math font (recommended).
+  \item \lstinline{math=newtx}, use \lstinline{newtxmath} math font (may bring about bugs).
+  \item \lstinline{math=mtpro2}, use \lstinline{mtpro2} package to set math font.
+\end{enumerate}
+
+If you use \lstinline{newtx} fonts, type in:
+\begin{lstlisting}
+\documentclass[math=newtx]{elegantbook}
+\end{lstlisting}
+
+When you are using \lstinline{newtx}, please pay attention to the hyphens. For instance,
+\begin{equation}
+\int_{R^q} f(x,y) dy.\emph{of\kern0pt f} \sin x
+\end{equation}
+
+The corresponding code is: 
+\begin{lstlisting}
+\begin{equation}
+  \int_{R^q} f(x,y) dy.\emph{of \kern0pt f} \sin x
+\end{equation}
+\end{lstlisting}
+
+\subsection{Symbol Fonts}
+Feedback from some 3.08 users claims that error occurs when using our templates with  \lstinline{yhmath}, \lstinline{esvect} and other packages.
+\begin{lstlisting}
+LaTeX Error:
+Too many symbol fonts declared.
+\end{lstlisting}
+
+The reason is that the template redefines font for math so that no new math font is allowed to be added. To use \lstinline{yhmath} and/or \lstinline{esvect}, please locate \lstinline{yhmath} or \lstinline{esvect} in \lstinline{elegantbook.cls}, uncomment corresponding related code.
+
+\begin{lstlisting}
+%%% use yhmath pkg, uncomment following code
+% \let\oldwidering\widering
+% \let\widering\undefined
+% \RequirePackage{yhmath}
+% \let\widering\oldwidering
+
+%%% use esvect pkg, uncomment following code
+% \RequirePackage{esvect}
+\end{lstlisting}
+
+\section{Bibliography}
+
+This template uses biblatex to generate the bibliography, the default citestyle and bibliography style are both \lstinline{numeric}. Let's take a glance at the citation effect. ~\cite{en1} use data from a major peer-to-peer lending \cite{en3} marketplace in China to study whether female and male investors evaluate loan performance differently \parencite{en2}. 
+
+If you want to use biblatex, you must create a file named \lstinline{reference.bib}, add bib items (from Google Scholar, Mendeley, EndNote, and etc.) to \lstinline{reference.bib} file, then cite the bibkey in the \lstinline{tex} file. The biber will automatically generate the bibliography for the reference you cited.
+
+In order to get the editors' auto-completion working, you need to add following code in your preamble:
+
+\begin{lstlisting}
+  \addbibresource[location=local]{reference.bib}
+\end{lstlisting}
+
+Then include the print commands where you want to print the bibliography:
+\begin{lstlisting}
+  \printbibliography[heading=bibintoc, title=\ebibname]
+\end{lstlisting}
+
+
+
+
+To change the bibliography style, this version introduces two options: \lstinline{citestyle} and \lstinline{bibstyle}, please refer to \href{https://ctan.org/pkg/biblatex}{CTAN:biblatex} for more detail about these options. You can change your bibliography style as
+
+\begin{lstlisting}
+\documentclass[citestyle=numeric-comp, bibstyle=authoryear]{elegantbook} 
+\end{lstlisting}
+
+We also add the \lstinline{bibend} option to this template, you can choose \lstinline{biber} (default) or \lstinline{bibtex} as you like, \lstinline{biber} is recommended.
+
+\begin{lstlisting}
+\documentclass[bibtex]{elegantbook} % or
+\documentclass[bibend=bibtex]{elegantbook}
+\end{lstlisting}
+
+\section{Preface}
+
+If you want to add a preface before the first chapter with the number of chapter unchanged, please add the preface in the following way:
+\begin{lstlisting}
+\chapter*{Introduction}
+\markboth{Introduction}{Introduction}
+The content of introduction.
+\end{lstlisting}
+
+\section{Content Option and Depth}
+Option for content \lstinline{toc}, you can  choose either one column(\lstinline{onecol}) or two columns(\lstinline{twocol}). For two columns:
+\begin{lstlisting}
+\documentclass[twocol]{elegantbook}
+\documentclass[toc=twocol]{elegantbook}
+\end{lstlisting}
+
+Default content depth is 1, use to use \lstinline|\setcounter{tocdepth}{2}|.
+
+\section{Introduction Environment}
+We create a introduction environment to display the structure of chapter. The basic useage is as follows:
+\begin{lstlisting}
+\begin{introduction}
+  \item Definition of Theorem
+  \item Ask for help
+  \item Optimization Problem
+  \item Property of Cauchy Series
+  \item Angle of Corner
+\end{introduction}
+\end{lstlisting}
+And you will get:
+\begin{introduction}
+  \item Definition of Theorem
+  \item Ask for help
+  \item Optimization Problem
+  \item Property of Cauchy Series
+  \item Angle of Corner
+\end{introduction}
+
+You can change the title of this environment by modifying the optional argument of this environment:
+\begin{lstlisting}
+\begin{introduction}[Brief Introduction]
+...
+\end{introduction}
+\end{lstlisting}
+
+%\section{Problem Set}
+The environment \lstinline{problemset} is used at the end of each chapter to display corresponding exercises. Just type in the following sentences:
+\begin{lstlisting}
+\begin{problemset}
+  \item exercise 1
+  \item exercise 2
+  \item exercise 3
+\end{problemset}
+\end{lstlisting}
+And you will get:
+\begin{problemset}
+  \item exercise 1
+  \item exercise 2
+  \item exercise 3
+  \item math equation test:
+  \begin{equation}
+  a^2+b^2=c_{2_{i}} (1,2) [1,23]
+  \end{equation}
+\end{problemset}
+\begin{remark}
+If you want to customize the title of \lstinline{problemset}, please change the optional argument like in introduction environment. In this version the \lstinline{problemset} environment automatically appears in the table of contents but not in the header or footer(to be fixed).
+\end{remark}
+
+\begin{solution}
+  If you want to customize the title of \lstinline{problemset}, please change the optional argument like in introduction environment. In this version the \lstinline{problemset} environment automatically appears in the table of contents but not in the header or footer(to be fixed).
+\end{solution}
+
+\section{Margin Notes}
+In 3.08, we introduced \lstinline{marginpar=margintrue} and \lstinline{\elegantpar} (Beta) with piles of bugs. Hence we decide to remove them in 3.09 and will suspend the options till revolutionary optimization. Sorry for all the bugs! However, we retain the option \lstinline{marginpar} for users to get margin motes by activating \lstinline{marginpar=margintrue} and using \lstinline{\marginpar} or \lstinline{marginnote} packages.
+
+\begin{remark}
+Note that text and equation are both available in the margin notes.
+\begin{lstlisting}
+% text
+\marginpar{margin paragraph text}
+
+% equation
+\marginpar{
+\begin{equation}
+  a^2 + b^2 = c^2
+\end{equation}
+}
+\end{lstlisting}
+
+For tables and figures, note that floating environment is not allowed. You have to use \lstinline{includegraphics} or \lstinline{table} and use \lstinline{\captionof} to name it. To get centralized figures or tables, use \lstinline{\centerline} or \lstinline{center}. To learn more, please refer to \href{https://tex.stackexchange.com/questions/5583/caption-of-figure-in-marginpar-and-caption-of-wrapfigure-in-margin}{Caption of Figure in Marginpar}.
+
+\begin{lstlisting}
+% graph with centerline command
+\marginpar{
+  \centerline{
+    \includegraphics[width=0.2\textwidth]{logo.png}
+  }
+  \captionof{figure}{your figure caption}
+}
+
+% graph with center environment
+\marginpar{
+  \begin{center}
+    \includegraphics[width=0.2\textwidth]{logo.png}
+    \captionof{figure}{your figure caption}
+  \end{center}
+}
+\end{lstlisting}
+
+\end{remark}
+
+
+
+\chapter{ElegantBook Writing Sample}
+
+\begin{introduction}
+\item Theorem Class Envrionments
+\item Cross Reference
+\item Math Environments
+\item List Environments
+\item Logo and Base 
+\item $a^2+b^2=c^2$
+\end{introduction}
+
+
+\lipsum[1]
+% source: https://www.maths.tcd.ie/~dwilkins/LaTeXPrimer/Theorems.html
+
+\section{Writing Sample}
+
+We will define the integral of a measurable function in three steps. First, we define the integral of a nonnegative simple function. Let $E$ be the measurable set in $\mathcal{R}^N$.
+
+\begin{definition}[Left Coset]
+Let $H$ be a subgroup of a group~$G$.  A \emph{left coset} of $H$ in $G$ is a subset of $G$ that is of the form $xH$, where $x \in G$ and $xH = \{ xh : h \in H \}$. Similarly a \emph{right coset} of $H$ in $G$ is a subset of $G$ that is of the form $Hx$, where $Hx = \{ hx : h \in H \} \hbar$ 
+\end{definition}
+
+\begin{note}
+Note that a subgroup~$H$ of a group $G$ is itself a left coset of $H$ in $G$.
+\end{note}
+
+\lipsum[2]
+
+\begin{theorem}[Lagrange's Theorem] \label{thm:lg}
+Let $G$ be a finite group, and let $H$ be a subgroup of $G$. Then the order of $H$ divides the order of $G$.
+\end{theorem}
+
+As theorem \ref{thm:lg} refered.
+
+\lipsum[3]
+
+
+\begin{theorem}{theorem name}{label text}
+  The content of theorem.
+\end{theorem}
+
+we can refer this theorem as \ref{thm:label text}.
+
+
+\begin{proposition}[Size of Left Coset]
+Let $H$ be a finite subgroup of a group $G$.  Then each left coset of $H$ in $G$ has the same number of elements as $H$.
+\end{proposition}
+
+\begin{proof}
+  Let $z$ be some element of $xH \cap yH$. Then $z = xa$ for some $a \in H$, and $z = yb$ for some $b \in H$. If $h$ is any element of $H$ then $ah \in H$ and $a^{-1}h \in H$, since $H$ is a subgroup of $G$. But $zh = x(ah)$ and $xh = z(a^{-1}h)$ for all $h \in H$. Therefore $zH \subset xH$ and $xH \subset zH$, and thus $xH = zH$.  Similarly $yH = zH$, and thus $xH = yH$, as required. 
+\end{proof}
+
+\begin{figure}[htbp]
+  \centering
+  \includegraphics[width=0.6\textwidth]{scatter.jpg}
+  \caption{Matplotlib: Scatter Plot Example\label{fig:scatter}}
+\end{figure}
+
+Regression analysis is a powerful statistical method that allows you to examine the relationship between two or more variables of interest. While there are many types of regression analysis, at their core they all examine the influence of one or more independent variables on a dependent variable. The process of performing a regression allows you to confidently determine which factors matter most, which factors can be ignored, and how these factors influence each other.
+
+Let's continue using our application training example. In this case, we'd want to measure the historical levels of satisfaction with the events from the past three years or so, as well as any information possible in regards to the independent variables. 
+
+\section{Second section}
+This second section\index{S!section} may include some special word, 
+and expand the ones already used\index{keywords!used}.
+
+
+\begin{table}[htbp]
+  \small
+  \centering
+  \caption{Auto MPG and Price \label{tab:reg}}
+    \begin{tabular}{lcc}
+    \toprule
+                    &       (1)         &        (2)      \\
+    \midrule
+    mpg             &    -238.90***     &      -49.51     \\
+                    &     (53.08)       &      (86.16)    \\
+    weight          &                   &      1.75***    \\
+                    &                   &      (0.641)    \\
+    constant        &     11,253***     &       1,946     \\
+                    &     (1,171)       &      (3,597)   \\
+    obs             &        74         &         74     \\
+    $R^2$           &      0.220        &       0.293    \\
+    \bottomrule
+    \multicolumn{3}{l}{\scriptsize Standard errors in parentheses} \\
+    \multicolumn{3}{l}{\scriptsize *** p<0.01, ** p<0.05, * p<0.1} \\
+    \end{tabular}%
+\end{table}%
+
+\lipsum[1-2]
+
+\begin{itemize}
+  \item Routing and resource discovery;
+       \begin{itemize} 
+             \item Language Models
+            \item Vector Space Models
+         \end{itemize}
+  \item Resilient and scalable computer networks;
+  \item Distributed storage and search.
+\end{itemize}
+
+%\problemset
+\begin{problemset}
+  \item Solve the equation $5(- 3x - 2) - (x - 3) = -4(4x + 5) + 13$.
+  \item Find the distance between the points $(-4 , -5)$ and $(-1 , -1)$.
+  \item Find the slope of the line $5x - 5y = 7$.
+\end{problemset}
+
+
+\chapter{FAQ}
+We list some FAQs for users to refer to:
+\begin{enumerate}
+  \item \question{Why option numbers for natbib fail to take effect in v3.07?}
+  In v3.07, when \lstinline{gbt7714} is introduced, option \lstinline{authoryear} is incompatible with \lstinline{natbib}. In v3.08 and 3.09, \lstinline{numbers}, \lstinline{numbers}, \lstinline{super} and \lstinline{authoryear} are introduced.
+  \item \question{I want to customize font and background color.}
+  Please use \lstinline{pagecolor} to change background color, refer to \href{https://tex.stackexchange.com/questions/278544/xcolor-what-is-the-equivalent-of-default-text-color}{this} to customize font.
+  \item \question{Which version should I choose?}
+  Please use \href{https://github.com/ElegantLaTeX/ElegantBook/releases}{Latest Release} via GitHub or \TeX{} Live 2022.
+  \item \question{Which editor should I choose?}
+  You can use \TeX{} Live 2022 built-in \TeX works or \TeX Studio. You may refer to \href{https://github.com/EthanDeng/texworks-autocomplete}{\TeX{}works autocomplete}. \TeX{} Live 2022 + \TeX{}studio is strongly recommended. Related configurations can be found at \href{https://github.com/EthanDeng/vscode-latex}{vscode-latex} and \href{https://github.com/EthanDeng/sublime-text-latex}{sublime-text-latex}.
+  \item \question{Hello, we want to use ElegantBook to write a book about machine learning and would like your authorization.}
+  Feel free to use our templates by pointing out our copyright. For other issues, please refer to LPPL-1.3c. If you want to show us your work, you can share the URL with us afterwards.
+  \item \question{What is cross reference?}
+  This template is aimed at who are not a complete beginner for \LaTeX{}. Please learn more about \LaTeX{} before using this template.
+  \item \question{Is the language for code highlighting optional?}
+  Yes, \lstinline{listings} package is used in ElegantBook, hence language is optional(e.g. \lstinline{language=Python}). For global setting, use \lstinline{lstset}. For more information, please refer to package documentations.
+  \item \question{When will Beamer template (ElegantSlide or ElegantBeamer) forthcoming?}
+  Since there is an excellent theme \href{https://github.com/matze/mtheme}{Metropolis}, no plan for Beamer theme.
+\end{enumerate}
+
+\chapter{Version History}
+We revised our templates now and then. This section shows the version story of ElegantBook.
+
+
+\datechange{2022/08/15}{release of v4.4.}
+
+\begin{change}
+  \item Add custome theorem definition command \lstinline{\elegantnewtheorem};
+  \item Fix star environment(*) for inner environments (\href{https://github.com/ElegantLaTeX/ElegantBook/issues/167}{issue \#167});
+  \item Change English fonts from TeX Gyre Termes to TeX Gyre TermesX;
+  \item Re-construct some theorem environments to enchance compatibility;
+  \item Remove Gitee repo due the privacy policy;
+  \item Re-open Github pull requests.
+\end{change}
+
+
+
+
+\datechange{2022/04/09}{release of v4.3.}
+
+\begin{change}
+  \item Remove part newtx settings, set TeX Gyre Termes/Heros fonts under \hologo{XeLaTeX}.
+  \item Fix Chinese fonts in the theorem environments.
+  \item Add theorem counter option, \lstinline{thmcnt=section}.
+  \item Add bib option \lstinline{bibend}, which can take value of biber and bibtex.
+  \item \textbf{! Warnings}: The multilingual option may cause some unexpected errors, you can report in this \href{https://github.com/ElegantLaTeX/ElegantBook/issues/170}{issue}.
+\end{change}
+
+
+
+\datechange{2022/03/08}{release of v4.2.}
+
+\begin{change}
+  \item Bug fix due to the update of newtx fonts;
+  \item Add `Chapter' in TOC, and redefine \lstinline{\chaptername} to unify the logic under different languages;
+  \item Add language option for Japanese, \lstinline{lang=jp}.
+\end{change}
+
+
+\datechange{2021/05/02}{release of v4.1.}
+
+\begin{change}
+  \item \textbf{! Big Change}: Change the bibliography method from \hologo{BibTeX} to biblatex(with backend  \lstinline{biber});
+  \item \textbf{! Big Change}: Add support for the default theorem writing method (with optional name and label);
+  \item Add left and right space;
+  \item Support hyperlink from the text of TOC;
+  \item Remove the \hologo{pdfLaTeX} compatiblity check for Chinese.
+  \item Add multilingual support, for french \lstinline{lang=fr}, dutch \lstinline{lang=nl}, Hungarian  \lstinline{lang=hu}, Spanish \lstinline{lang=es}, Mongolian \lstinline{lang=mn} etc.
+\end{change}
+
+\datechange{2020/04/12}{release of v3.11, \textcolor{red}{\textbf{LAST} version of 3.x}.}
+
+
+\begin{change}
+  \item \textbf{! Fix}: Fix \lstinline{natbib option clash} problems caused by \lstinline{gbt7714} updates.
+  \item Remove \lstinline{base} decorations and its options since \lstinline{pgfornament} package is not included in \TeX{} Live 2020.
+  \item Fix spacing problem in some environments.
+  \item Introduce language option for Italian, \lstinline{lang=it}.
+\end{change}
+
+
+\datechange{2020/02/10}{release of v3.10}
+
+\begin{change}
+  \item Introduce \lstinline{math} for math font, optional styles are \lstinline{newtx} and \lstinline{cm}.\\
+  \textbf{Notice}: The math font \lstinline{newtxmath} in previous versions is reset to default \LaTeX{} math font, to keep previous math font, please declare \lstinline{math=newtx}.
+  \item Introduce \lstinline{chinesefont} option, with \lstinline{founder}, \lstinline{ctexfont} and \lstinline{nofont} available.
+  \item Turn author information on the cover optional and add customized command \lstinline{\bioinfo}.
+  \item Add version history with command \lstinline{\datechange} and environment \lstinline{change}.
+  \item Add Chinese chapter style \lstinline{scheme} with option \lstinline{chinese}.
+  \item Since the bug raised by \lstinline{\lvert} is fixed, exchange package positions of \lstinline{ctex} and \lstinline{amsmath}.
+  \item Drop \lstinline{\lastpage} from header to avoid page anchor bug and adding \lstinline{\frontmatter}.
+  \item Revise bibliography option \lstinline{cite} with optional styles \lstinline{numbers},\lstinline{authoryear} and \lstinline{super}.
+  \item Introduce bibliography style option \lstinline{bibstyle}, with default bib style \lstinline{apalike} for English mode and \lstinline{gbt7714} package for Chinese mode.
+\end{change}
+
+\datechange{2019/08/18}{release of v3.09}
+
+\begin{change}
+  \item Remove \lstinline{\elegantpar} temporary and remind users to use \lstinline{\marginnote} and \lstinline{\marginpar} instead.
+  \item Use \lstinline{esint} to display integral operator.
+  \item Add new command \lstinline{toc}, with options  \lstinline{onecol} and \lstinline{twocol}.
+  \item Add new option \lstinline{cite} \lstinline{super} for superscript-displayed citation.
+  \item Revise \lstinline{problemset}.
+\end{change}
+
+
+\nocite{en2,en3}
+
+\printbibliography[heading=bibintoc, title=\ebibname]
+\appendix
+
+
+\chapter{Mathematical Tools}
+
+This appendix covers some of the basic mathematics used in econometrics. We briefly discuss the properties of summation operators, study the properties of linear and some nonlinear equations, and review the ratios and percentages. We also introduce some special functions that are common in econometrics applications, including quadratic functions and natural logarithms. The first four sections require only basic algebraic techniques. The fifth section briefly reviews differential Calculus Although Calculus is not necessary to understand much of this book, it is used in some of the end-of-chapter appendices and in some of the more advanced topics in part 3.
+
+\section{Summation Operator and Description Statistics}
+
+\textbf{Summation Operator} is an abbreviation used to express the summation of numbers, it plays an important role in statistics and econometrics analysis. If $\{x_i: i=1, 2, \ldots, n\}$ is a sequence of $n$ numbers, the summation of the $n$ numbers is:
+
+\begin{equation}
+\sum_{i=1}^n x_i \equiv x_1 + x_2 +\cdots + x_n
+\end{equation}
+
+
+\end{document}

guide.tex

@@ -1,266 +0,0 @@
-%!TEX program = xelatex
-\documentclass[mathpazo,titlestyle=hang,11pt]{elegantbook}
-
-\author{ddswhu \& LiamHuang0205}
-\email{ddswhu@outlook.com}
-
-\zhtitle{优美的\LaTeX{} 书籍}
-\zhend{模板}
-\entitle{Elegant\LaTeX{} Book}
-\enend{Template}
-\version{2.30}
-\myquote{Victory won\rq t come to us unless we go to it.}
-\logo{logo.pdf}
-\cover{cover.pdf}
-
-%green color
-   \definecolor{main1}{RGB}{0,120,2}
-   \definecolor{seco1}{RGB}{230,90,7}
-   \definecolor{thid1}{RGB}{0,160,152}
-%cyan color
-   \definecolor{main2}{RGB}{0,175,152}
-   \definecolor{seco2}{RGB}{239,126,30}
-   \definecolor{thid2}{RGB}{120,8,13}
-%blue color
-   \definecolor{main3}{RGB}{20,50,104}
-   \definecolor{seco3}{RGB}{180,50,131}
-   \definecolor{thid3}{RGB}{7,127,128}
-
-\usepackage{makecell}
-\usepackage{lipsum}
-\usepackage{texnames}
-
-
-\begin{document}
-\maketitle
-\tableofcontents
-\mainmatter
-\chapter{ElegantBook 模板的由来}
-
-只有当自己想去做一件事的时候才能把事情做好！
-
-
-\section{ElegantNote 的前世今生}
-
-写 ElegantNote 模板的初衷是为了简化我在写笔记中的工作，因为我不会写类文件和包文件，所以，最当初是想拜托小L做出一个华丽，清爽的 \LaTeX{} 模板，最好是类文件，而且因为这样可以简化导言区复杂的内容。后来，和小L一拍即合，遂开始一起做Elegant\LaTeX{}的设计。
-
-在学校的时候，搞定了定理环境样式的代码。因为不想重复 China\TeX{} 那个经典的页眉页脚，我找到了计量书上的一个图案，小L拿 Ti\emph{k}Z 一点一点把那个画出来了，不过我最后还是用的截取的方式得到的图案。慢慢地，我们把初步的样子做出来了。
-
-2013年的暑假开始后，我对那个初步的模板做了一点改动，然后用它写了Dynamic Programing 的笔记，并且，在写的过程中，对模板加了封面，也就是模板现在的封面（logo 在Version 2.00中已经改了）。至此，模板的大致样子终于出来了，不过当时也在写笔记的过程中知道了某些不足，比如
-\begin{enumerate}
-\item 定理类的环境在我们这个模板中不能浮动，也不能跨页，在Version 2.00 版本中已经添加。
-\item 某些环境不足，比如例子、假设、性质、结论等环境，在1.00版本中已经增加了这几个环境，在2.00版本中，环境设置更加全面。
-\item 一些我们不可预知的错误将会不期而遇。
-\item 一些我们目前没有需求，但是可以继续改进的地方，比如表格样式，比如抄录样式等。
-\end{enumerate}
-
-写完那个笔记之后越发让我对 Elegant\LaTeX{} 模板的制作更有激情，在和小L相互讨论的几天里，我们终于得到了1.00 版本的 ElegantNote 模板。
-
-\section{ElegantBook 的诞生}
-
-在实际应用中，我们发现了一个比较重要的问题，因为在一般的笔记中，定义、定理经常一起出现，和课本区别比较大的是，通常是一堆定义之后，出现一堆性质或者定理。如果出现这种情况，使用 ElegantNote 模板会导致分块很严重，影响排版质量和美观。思前想后，我们决定将 ElegantNote 模板更新为 ElegantBook 模板，并在未来重新设计一个简洁版本的 ElegantNote。 至此ElegantBook 才横空出世，由于更名原因，ElegantBook 1.00 版本也即原来的 ElegantNote， 而ElegantBook 2.00 为目前的正式版本。
-
-\section{一张白纸折腾出的一个模板}
-
-我以前从未写过类文件，所以，写这个模板的过程必然是折腾的过程，在写模板的过程中，最主要参考了《写给\LaTeXe{} 类与宏包的作者》\cite{packagewriter}、moderncv.cls 文件、\href{http://aff.whu.edu.cn/huangzh/}{武汉大学黄正华老师的论文模板}、《\LaTeXe{} 完全学习手册》\cite{complete}、{\itshape The Not So Short Introduction to \LaTeXe{}}\cite{oetiker2010not}以及各大\LaTeX{} 疑问解答网站，在此为无私奉献的组织和个人表示感谢！
-
-{\color{thid}忍不住插个图！}
-
-\begin{figure}[!hbtp]
-\includegraphics[width=0.8\textwidth]{happy.jpg}
-\caption{Happiness,we have it!\label{figur:happy}}
-\end{figure}
-
-\chapter{ElegantBook 开服说明}
-\section{关于我们}
- 我们目前都是学生，接触 \LaTeX{} 的时间也不是很长，因此，对于此模板的错误还请多多包涵！ 目前，模板的拓展性或者可移植性有待完善，所以，我们强烈建议用户不要大幅修改模板文件，我们的初衷是提供一套模板，让初学者能够使用一些比较美观，优雅的模板。如果在使用过程中，想修改一些简单的东西需要帮忙，请联系我们，我们的邮箱是：\href{elegantlatex2e@gmail.com}{elegantlatex2e@gmail.com}。我们将竭尽全力提供帮助！
-
-值此版本发行之际，我们 Elegant\LaTeX{} 项目组向大家重新介绍一下我们的工作，我们的主页是 \href{http://elegantlatex.org}{http://elegantlatex.org}，我们这个项目致力于打造一系列美观、优雅、简便的模板方便使用者记录学习历史。其中目前在实施或者在规划中的子项目有 书籍模板ElegantBook、笔记模板ElegantNote、幻灯片模板 ElegantSlide。这些子项目的名词是一体的，请在使用这些名词的时候不要将其断开（如 Elegant Note是不正确的写法）。并且，Elegant\LaTeX{}  Book 指的即是 ElegantBook。
-
-如果您在使用此模板，方便的话，是否可以把您使用此模板制作的成品发一份给我们，谢谢！
-
-\section{关于字体}
-
-基于本模板追求视觉上的美观的角度，强烈建议使用者安装./fonts/文件夹下的字体。出于版权的考虑，务必不能将此模板用于涉及盈利目的的商业行为，否则，后果自负，本模板带的字体仅供学习使用，如果您喜欢某种字体，请自行购买正版。本文主要使用的字体如下
-
-\begin{itemize}
-\itemsep=3pt
-\parskip=0pt
-\item Adobe Garamond Pro
-\item 方正苏新诗柳楷简体
-\item 方正启体简体
-\end{itemize}
-
-\begin{note}
-虽然我们模板更新到了 2.30 了（主要是字体删除，交叉引用的紧急修复），但是使用文档部分并没有更新（仍然是 2.00），在使用过程中，请尽量参考文档说明，如果有问题，可以联系我们。
-
-如果系统内安装了Adobe 字体，大家可以把模板中使用到的黑体，楷体，宋体等字替换成 Adobe 字体，这样可以达到最佳效果。
-\end{note}
-
-\section{文档说明}
-\subsection{编译方式}
-本模板基于book文类，所以book的选项对于本模板也是有效的。但是，只支持 \XeLaTeX{}，编码为 UTF-8，推荐使用 \TeX{}live编译。作者编写环境为Win8.1(64bit)+\TeX{}live 2013，由于使用了参考文献，所以，编译顺序为\XeLaTeX->\BibTeX->\XeLaTeX->\XeLaTeX。
-
-本文特殊选项设置共有3类，分为{\color{main}颜色} 、{\color{main} 数学字体 }以及{\color{main} 章标题显示风格}。
-
-\subsection{选项设置}
-第一类为{\color{main}颜色}主题设置，内置 3 组颜色主题，分别为 \verb|green|（默认），\verb|cyan|，\verb|blue|，另外还有一个自定义的选项 \verb|nocolor|，用户\textbf{必须}在使用模板的时候选择某个颜色主题或选择 \verb|nocolor|选项。调用颜色主题 \verb|green| 的方法为\verb|\documentclass[green]{elegantbook}|或者使用\verb|\documentclass[color=green]{elegantbook}|。需要改变颜色的话请选择 \verb|nocolor|选项或者使用 \verb|color=none|，然后在导言区定义main、seco、thid颜色，具体的方法如下：
-\begin{verbatim}
-\definecolor{main}{RGB}{70,70,70}    %定义main颜色值
-\definecolor{seco}{RGB}{115,45,2}    %定义seco颜色值
-\definecolor{thid}{RGB}{0,80,80}     %定义thid颜色值
-\end{verbatim}
-
-第二类为{\color{main}数学字体}设置，有两个可选项，分别是 mathpazo（默认） 和 mtpro2 字体，调用mathpazo 字体使用 \verb|\documentclass[mathpazo]{elegantbook}|，调用 mtpro2 字体时需要把 \verb|mathpazo|换成 \verb|mtpro|，mathpazo 不需要用户自己安装字体，mtpro2 的字体需要自己安装。
-
-\begin{table}[htp]
-\centering
-\begin{tabular}{ccccc}
-\toprule
-	  & green & cyan & blue & 主要使用的环境\\
-\midrule
-main & \makecell{{\color{main1}\rule{1cm}{1cm}}}& \makecell{{\color{main2}\rule{1cm}{1cm}}}&\makecell{ {\color{main3}\rule{1cm}{1cm}}}& newthem \ newlemma \ newcorol\\
-
-seco &\makecell{ {\color{seco1}\rule{1cm}{1cm}}}& \makecell{{\color{seco2}\rule{1cm}{1cm}}}&\makecell{ {\color{seco3}\rule{1cm}{1cm}}}&newdef\\
-
-thid &\makecell{ {\color{thid1}\rule{1cm}{1cm}}}& \makecell{{\color{thid2}\rule{1cm}{1cm}}}&\makecell{ {\color{thid3}\rule{1cm}{1cm}}}&newprop\\
-\bottomrule
-\end{tabular}
-\caption{ElegantBook 模板中的三套颜色主题\label{tab:color thm}}
-\end{table}
-
-第三类为{\color{main} 章标题显示风格}，包含 \verb|hang|（默认）与 \verb|display|两种风格，区别在于章标题单行显示（\verb|hang|）与双行显示（\verb|display|），本说明使用了 \verb|hang|。调用方式为 \verb|\documentclass[hang]{elegantbook}|或者 \verb|\documentclass[titlestyle=hang]{elegantbook}|。
-
-综合起来，同时调用三个选项使用 \verb|\documentclass[color=X,Y,titlestyle=Z]{elegantbook}|。其中 \verb|X| 可以选择 \verb|green|,\verb|cyan|,\verb|blue|,\verb|none|；\verb|Y| 可以选择 \verb|mathpazo|或者 \verb|mtpro|；\verb|Z|可以选择 \verb|hang| 或者 \verb|display|。
-
-\subsection{数学环境简介}
-在我们这个模板中，定义了三大类环境
-\begin{enumerate}
-\item 定理类环境，包含标题和内容两部分。根据格式的不同分为3种
-\begin{itemize}
-\item {\color{main} newthem、newlemma、newcorol} 环境，颜色为主颜色main，三者编号均以章节为单位；
-\item {\color{main} newdef} 环境，含有一个可选项，编号以章节为单位，颜色为seco；
-\item {\color{main} newprop} 环境，含有一个可选项，编号以章节为单位，颜色为thid。
-\end{itemize}
-\item 证明类环境，有  {\color{main} newproof、note、remark、solution} 环境，特点是，有引导符和引导词，并且 newproof、solution 环境有结束标志。
-\item 结论类环境，有 {\color{main}  conclusion、assumption、property} 环境，三者均以粗体的引导词为开头，和普通段落格式一致。
-\item 示例类环境--- {\color{main} example、exercise}环境，编号以章节为单位，其中exercise环境有引导符。
-\item 自定义环境--- {\color{main} custom}，带一个必选参数，格式与conclusion 环境很类似。
-\end{enumerate}
-
-\subsection{可编辑的字段}
-在模板中，可以编辑的字段分别为作者\verb|\author|、\verb|\email|、\verb|\zhtitle|、\verb|\zhend|、\verb|\entitle|、\verb|\enend|、\verb|\version|。并且，可以根据自己的喜好把封面水印效果的\verb|cover.pdf|替换掉，以及封面中用到的\verb|logo.pdf|。
-
-\chapter{ElegantBook 写作示例}
-
-\section{灵魂不随便出卖，代码也不随便瞎写}
-\lipsum[3]
-考虑如下的随机动态规划问题
-\begin{align*}
-&\max(\min)\quad \mathbb{E}\int_{t_0}^{t_1}f(t,x,u)\,dt\\
-&\quad\mbox{s.t.} \quad dx=g(t,x,u)dt+\sigma(t,x,u)dz\\
-&\quad \hspace{2.em} k(0)=k_0\;\text{given}
-\end{align*}
-
-where $z$ is stochastic process or white noise or wiener process.
-
-\begin{newdef}[Wiener Process]
-If $z$ is wiener process, then for any partition $t_0,t_1,t_2,\ldots$ of time interval, the random variables $z(t_1)-z(t_0),z(t_2)-z(t_1),\ldots$ are independently and normally distributed with zero means and variance $t_1-t_0,t_2-t_1,\ldots$
-\end{newdef}
-
-\lipsum[5]
-
-\begin{example}
-$E$ and $F$ be two events such that $\mbf{P}(E)=\mbf{P}(F)=1/2$, and $\mbf{P}(E\cap F)=1/3$, let $\mathscr{F}=\sigma(Y)$,  $X$ and $Y$ be the indicate function of $E$ and $F$ respectively. How to compute $\mathbb{E}[ X\mid \mathscr{F} ]$?
-\end{example}
-\lipsum[4]
-\begin{exercise}
-let $S=l^\infty=\big\{(x_n)\mid \exists\, M \text{ such that } \forall n, |x_n|\leq M,x_n\in \mathbb{R}\big\}$, $\rho_{\infty}(x,y)=\sup\limits_{n\geq 1}|x_n-y_n|$, show that $\big(l^\infty,\rho_{\infty}\big)$ is complete.
-\end{exercise}
-
-\begin{newthem}[勾股定理]\label{thm:31}
-勾股定理的数学表达（Expression）为
-\[a^2+b^2=c^2\]
-其中$a,b$为直角三角形的两条直角边长，$c$为直角三角形斜边长。
-\end{newthem}
-
-\begin{note}
-在本模板中，引理（lemma），推论（corollary ）的样式和定理的样式一致，包括颜色，仅仅只有计数器的设置不一样。在这个例稿中，我们将不给出引理推论的例子。
-\end{note}
-
-
-\lipsum[4]
-
-\begin{newprop}[最优性原理]
-如果$u^*$在$[s,T]$上为最优解，则$u^*$在$[s,T]$任意子区间都是最优解，假设区间为$[t_0,t_1]$的最优解为$u^*$，则$u(t_0)=u^{*}(t_0)$，即初始条件必须还是在$u^*$上。
-\end{newprop}
-
-\lipsum[5-6]
-\begin{newcorol}
-假设$V(\cdot,\cdot)$为值函数，则跟据最大值原理~\ref{thm:31}，有如下推论
-\[
-V(k,z)=\max\Big\{u\big(zf(k)-y\big)+\beta \mathbb{E}V(y,z^\prime)\Big\}
-\]
-\end{newcorol}
-
-\begin{newproof}
-因为 $y^*=\alpha\beta z k^\alpha$，$V(k,z)=\alpha/1-\alpha\beta\ln k_0+1/1-\alpha\beta \ln z_0+\Delta$。
-\begin{align*}
-\text{右边}&=\Big\{u\big(zf(k)-y\big)+\beta \mathbb{E}V(y,z^\prime)\Big\}\\
-&=\ln(zk^\alpha-\alpha\beta zk^\alpha)+\beta\mathbb{E}\Big[\frac{\alpha}{1-\alpha\beta}\ln y+\frac{1}{1-\alpha\beta}\ln z^\prime+\Delta\Big]\\
-&=\ln(1-\alpha\beta)zk^\alpha+\beta\Big\{\mathbb{E}\big[\frac{\alpha}{1-\alpha\beta}\ln \alpha\beta z k^\alpha\big]+\frac{1}{1-\alpha\beta}\mathbb{E}[\ln z^\prime]+\Delta\Big\}
-\end{align*}
-利用$\mathbb{E}[\ln z^\prime]=0$，并将对数展开得
-\begin{align*}
-\text{右边}&=\ln (1-\alpha\beta)+\ln z+\alpha\ln k+\frac{\alpha\beta}{1-\alpha\beta}\big[\ln \alpha\beta+\ln z+\alpha\ln k\big]+\frac{\beta}{1-\alpha\beta}\mu+\beta \Delta\\
-&=\frac{\alpha}{1-\alpha\beta}\ln k+\frac{1}{1-\alpha\beta}\ln z+\Delta
-\end{align*}
-所以$\text{左边}=\text{右边}$，证毕。
-\end{newproof}
-
-
-
-\begin{property}
-Properties of Cauchy Sequence
-\begin{enumerate}\parskip=0pt \itemsep=0pt
-\item $\{x_k\}$ is cauchy sequence then $\{x_k^i\}$ is cauchy sequence.
-\item $x_k\in \mathbb{R}^n$, $\rho(x,y)$ is Euclidean, then cauchy is equivalent to convergent, $(\mathbb{R}^n,\rho)$ metric space is complete.
-\end{enumerate}
-\end{property}
-
-
-\lipsum[7]
-
-\begin{custom}{Application}
-This is one example of the custom environment, the key word is given by the option of custom environment.
-\end{custom}
-
-
-\lipsum[6]
-\begin{newdef}[Contraction mapping]
-$(S,\rho)$ is the metric space, $T: S\to S$, If there exists $\alpha\in(0,1)$ such that for any $x$ and $y\in S$, the distance
-\begin{equation}
-\rho(Tx,Ty)\leq \alpha\rho(x,y)
-\end{equation}
-Then $T$ is a {\color{main} contraction mapping}.
-\end{newdef}
-
-\begin{remark}
-\begin{enumerate}
-\parskip=0pt \itemsep=0pt
-\item $T:S\to S$, where $S$ is a metric space, if  for any $x,y\in S$, $\rho(Tx,Ty)<\rho(x,y)$ is not contraction mapping.
-\item Contraction mapping is continuous map.
-\end{enumerate}
-\end{remark}
-
-
-\begin{conclusion}
-看到一则小幽默，是这样说的：{\color{main} 别人都关心你飞的有多高，只有我关心你的翅膀好不好吃！}说多了都是泪啊！
-\end{conclusion}
-
-
-\bibliographystyle{ieeetr}
-\bibliography{reference}
-\addcontentsline{toc}{chapter}{参考文献}
-
-\end{document}

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 }