evan.sty

% evan.sty
% If you don't know how to use this file, read:
% https://web.evanchen.cc/faq-latex.html#L-4

% %%%%%%%%%%%%%%%%%%%%%%
% %%     evan.sty     %%
% %%%%%%%%%%%%%%%%%%%%%%
%
% This file is licensed under the BOOST software license 1.0.
% This basically means you can do whatever you want with it,
% as long as any TeX source versions published
% include my name and this copyright notice.
% The compiled PDF itself is NOT required to have an attribution,
% although of course such attributions are greatly appreciated :D
% Here is the text of the license:
%
% Boost Software License - Version 1.0 - August 17th, 2003
%
% Copyright (c) 2020 Evan Chen [evan at evanchen.cc]
% https://web.evanchen.cc/ || github.com/vEnhance
%
% Permission is hereby granted, free of charge, to any person or organization
% obtaining a copy of the software and accompanying documentation covered by
% this license (the "Software") to use, reproduce, display, distribute,
% execute, and transmit the Software, and to prepare derivative works of the
% Software, and to permit third-parties to whom the Software is furnished to
% do so, all subject to the following:
%
% The copyright notices in the Software and this entire statement, including
% the above license grant, this restriction and the following disclaimer,
% must be included in all copies of the Software, in whole or in part, and
% all derivative works of the Software, unless such copies or derivative
% works are solely in the form of machine-executable object code generated by
% a source language processor.
%
% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
% FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
% SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
% FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
% ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
% DEALINGS IN THE SOFTWARE.

\ProvidesPackage{evan}
%%fakesection Argument processing
% Default Arguments
% We include "Evan" in all of these to make sure
% that they don't collide with anything in external packages
\newif\ifevanfancy\evanfancytrue
\newif\ifevanhdr\evanhdrtrue
\newif\ifevanhref\evanhreftrue
\newif\ifevansetup\evansetuptrue
\newif\ifevanthm\evanthmtrue
\newif\ifevansecthm\evansecthmfalse
\newif\ifevanht\evanhtfalse
\newif\ifevanpkg\evanpkgtrue
\newif\ifevanpdf\evanpdftrue
\newif\ifevanauthor\evanauthortrue
\newif\ifevanchinese\evanchinesefalse
\newif\ifevanmdthm\evanmdthmfalse
\newif\ifevandiagrams\evandiagramsfalse
\newif\ifevanpatchasy\evanpatchasyfalse
\newif\ifevanhints\evanhintsfalse
\newif\ifevanasy\evanasytrue
\newif\ifevancolorsec\evancolorsecfalse
\newif\ifevantitlemark\evantitlemarktrue
\newif\ifevanvonenabled\evanvonenabledfalse
\newif\ifevanbritish\evanbritishtrue

%Receive Arguments
\DeclareOption{chinese}{\evanhreffalse\evanchinesetrue} % Chinese support
% allow href to override this one

\DeclareOption{sexy}{\evansecthmtrue\evanmdthmtrue\evancolorsectrue} % long docs

\DeclareOption{fancy}{\evanfancytrue}
\DeclareOption{nofancy}{\evanfancyfalse}
\DeclareOption{hdr}{\evanhdrtrue}
\DeclareOption{nohdr}{\evanhdrfalse}
\DeclareOption{href}{\evanhreftrue}
\DeclareOption{nohref}{\evanhreffalse}

\DeclareOption{nosetup}{\evansetupfalse}
\DeclareOption{thm}{\evanthmtrue}
\DeclareOption{nothm}{\evanthmfalse}
\DeclareOption{secthm}{\evansecthmtrue}
\DeclareOption{nosecthm}{\evansecthmfalse}

\DeclareOption{ht}{\evanhttrue}
\DeclareOption{nopdf}{\evanpdffalse}
\DeclareOption{nopkg}{\evanpkgfalse}
\DeclareOption{noauthor}{\evanauthorfalse}
\DeclareOption{titlemark}{\evantitlemarktrue} % Sets title in ohead, not \rightmark
\DeclareOption{sectionmark}{\evantitlemarkfalse} % Uses \rightmark not title in ohead

\DeclareOption{mdthm}{\evanmdthmtrue}
\DeclareOption{nomdthm}{\evanmdthmfalse}
\DeclareOption{diagrams}{\evandiagramstrue}
\DeclareOption{nodiagrams}{\evandiagramsfalse}
\DeclareOption{colorsec}{\evancolorsectrue}
\DeclareOption{nocolorsec}{\evancolorsecfalse}

\DeclareOption{patchasy}{\evanpatchasytrue}
\DeclareOption{noasy}{\evanasyfalse}

\DeclareOption{hints}{\evanhintstrue}
\DeclareOption{von}{\evanvonenabledtrue}

\DeclareOption{british}{\evanbritishtrue}
\DeclareOption{american}{\evanbritishfalse}

\ProcessOptions\relax

% if packages not loaded, turn off mdthm and asy
\ifevanpkg\else\evanmdthmfalse\fi
\ifevanpkg\else\evanasyfalse\fi

% If no setup, turn off theorems
\ifevansetup\else\evanthmfalse\fi

%%fakesection Some macros
%Small commands
\ifevanpkg
	\usepackage{amsmath,amssymb}
\fi
\newcommand{\cbrt}[1]{\sqrt[3]{#1}}
\newcommand{\floor}[1]{\left\lfloor #1 \right\rfloor}
\newcommand{\ceiling}[1]{\left\lceil #1 \right\rceil}
\newcommand{\mailto}[1]{\href{mailto:#1}{\texttt{#1}}}
\newcommand{\ol}{\overline}
\newcommand{\ul}{\underline}
\newcommand{\wt}{\widetilde}
\newcommand{\wh}{\widehat}
\newcommand{\eps}{\varepsilon}
%\renewcommand{\iff}{\Leftrightarrow}
%\renewcommand{\implies}{\Rightarrow}
\newcommand{\vocab}[1]{\textbf{\color{blue}\sffamily #1}}
\providecommand{\alert}{\vocab}
\providecommand{\half}{\frac{1}{2}}
\newcommand{\catname}{\mathsf}
\newcommand{\hrulebar}{
  \par\hspace{\fill}\rule{0.95\linewidth}{.7pt}\hspace{\fill}
  \par\nointerlineskip \vspace{\baselineskip}
}

%For use in author command
\newcommand{\plusemail}[1]{\\ \normalfont \texttt{\mailto{#1}}}

%More commands and math operators
\DeclareMathOperator{\cis}{cis}
\DeclareMathOperator*{\lcm}{lcm}
\DeclareMathOperator*{\argmin}{arg min}
\DeclareMathOperator*{\argmax}{arg max}

%Convenient Environments
\newenvironment{soln}{\begin{proof}[Solution]}{\end{proof}}
\newenvironment{parlist}{\begin{inparaenum}[(i)]}{\end{inparaenum}}
\newenvironment{gobble}{\setbox\z@\vbox\bgroup}{\egroup}

%Inequalities
\newcommand{\cycsum}{\sum_{\mathrm{cyc}}}
\newcommand{\symsum}{\sum_{\mathrm{sym}}}
\newcommand{\cycprod}{\prod_{\mathrm{cyc}}}
\newcommand{\symprod}{\prod_{\mathrm{sym}}}

%From H113 "Introduction to Abstract Algebra" at UC Berkeley
\newcommand{\CC}{\mathbb C}
\newcommand{\FF}{\mathbb F}
\newcommand{\NN}{\mathbb N}
\newcommand{\QQ}{\mathbb Q}
\newcommand{\RR}{\mathbb R}
\newcommand{\ZZ}{\mathbb Z}
\newcommand{\charin}{\text{ char }}
\DeclareMathOperator{\sign}{sign}
\DeclareMathOperator{\Aut}{Aut}
\DeclareMathOperator{\Inn}{Inn}
\DeclareMathOperator{\Syl}{Syl}
\DeclareMathOperator{\Gal}{Gal}
\DeclareMathOperator{\GL}{GL} % General linear group
\DeclareMathOperator{\SL}{SL} % Special linear group

%From Kiran Kedlaya's "Geometry Unbound"
\newcommand{\abs}[1]{\left\lvert #1 \right\rvert}
\newcommand{\norm}[1]{\left\lVert #1 \right\rVert}
\newcommand{\dang}{\measuredangle} %% Directed angle
\newcommand{\ray}[1]{\overrightarrow{#1}}
\newcommand{\seg}[1]{\overline{#1}}
\newcommand{\arc}[1]{\wideparen{#1}}

%From M275 "Topology" at SJSU
\newcommand{\id}{\mathrm{id}}
\newcommand{\taking}[1]{\xrightarrow{#1}}
\newcommand{\inv}{^{-1}}

%From M170 "Introduction to Graph Theory" at SJSU
\DeclareMathOperator{\diam}{diam}
\DeclareMathOperator{\ord}{ord}
\newcommand{\defeq}{\overset{\mathrm{def}}{=}}

%From the USAMO .tex files
\newcommand{\ts}{\textsuperscript}
\newcommand{\dg}{^\circ}
\newcommand{\ii}{\item}

% From Math 55 and Math 145 at Harvard
\newenvironment{subproof}[1][Proof]{%
\begin{proof}[#1] \renewcommand{\qedsymbol}{$\blacksquare$}}%
{\end{proof}}

\newcommand{\liff}{\leftrightarrow}
\newcommand{\lthen}{\rightarrow}
\newcommand{\opname}{\operatorname}
\newcommand{\surjto}{\twoheadrightarrow}
\newcommand{\injto}{\hookrightarrow}
\newcommand{\On}{\mathrm{On}} % ordinals
\DeclareMathOperator{\img}{im} % Image
\DeclareMathOperator{\Img}{Im} % Image
\DeclareMathOperator{\coker}{coker} % Cokernel
\DeclareMathOperator{\Coker}{Coker} % Cokernel
\DeclareMathOperator{\Ker}{Ker} % Kernel
\DeclareMathOperator{\rank}{rank}
\DeclareMathOperator{\Spec}{Spec} % spectrum
\DeclareMathOperator{\Tr}{Tr} % trace
\DeclareMathOperator{\pr}{pr} % projection
\DeclareMathOperator{\ext}{ext} % extension
\DeclareMathOperator{\pred}{pred} % predecessor
\DeclareMathOperator{\dom}{dom} % domain
\DeclareMathOperator{\ran}{ran} % range
\DeclareMathOperator{\Hom}{Hom} % homomorphism
\DeclareMathOperator{\Mor}{Mor} % morphisms
\DeclareMathOperator{\End}{End} % endomorphism

% Things Lie
\newcommand{\kb}{\mathfrak b}
\newcommand{\kg}{\mathfrak g}
\newcommand{\kh}{\mathfrak h}
\newcommand{\kn}{\mathfrak n}
\newcommand{\ku}{\mathfrak u}
\newcommand{\kz}{\mathfrak z}
\DeclareMathOperator{\Ext}{Ext} % Ext functor
\DeclareMathOperator{\Tor}{Tor} % Tor functor
\newcommand{\gl}{\opname{\mathfrak{gl}}} % frak gl group
\renewcommand{\sl}{\opname{\mathfrak{sl}}} % frak sl group chktex 6

% More script letters etc.
\newcommand{\SA}{\mathcal A}
\newcommand{\SB}{\mathcal B}
\newcommand{\SC}{\mathcal C}
\newcommand{\SF}{\mathcal F}
\newcommand{\SG}{\mathcal G}
\newcommand{\SH}{\mathcal H}
\newcommand{\OO}{\mathcal O}

\newcommand{\SCA}{\mathscr A}
\newcommand{\SCB}{\mathscr B}
\newcommand{\SCC}{\mathscr C}
\newcommand{\SCD}{\mathscr D}
\newcommand{\SCE}{\mathscr E}
\newcommand{\SCF}{\mathscr F}
\newcommand{\SCG}{\mathscr G}
\newcommand{\SCH}{\mathscr H}

% Mathfrak primes
\newcommand{\km}{\mathfrak m}
\newcommand{\kp}{\mathfrak p}
\newcommand{\kq}{\mathfrak q}

%% Napkin commands
\newcommand{\prototype}[1]{
	\emph{{\color{red} Prototypical example for this section:} #1} \par\medskip
}
\newenvironment{moral}{%
	\begin{mdframed}[linecolor=green!70!black]%
	\bfseries\color{green!70!black}}%
	{\end{mdframed}}

%%fakesection Asymptote setup
\ifevanasy
	\ifevanpatchasy
		\usepackage{patch-asy}
	\else
		\usepackage{asymptote}
	\fi
	\begin{asydef}
		defaultpen(fontsize(10pt));
		size(8cm); // set a reasonable default
		usepackage("amsmath");
		usepackage("amssymb");
		settings.tex="pdflatex";
		settings.outformat="pdf";
		// Replacement for olympiad+cse5 which is not standard
		import geometry;
		// recalibrate fill and filldraw for conics
		void filldraw(picture pic = currentpicture, conic g, pen fillpen=defaultpen, pen drawpen=defaultpen)
			{ filldraw(pic, (path) g, fillpen, drawpen); }
		void fill(picture pic = currentpicture, conic g, pen p=defaultpen)
			{ filldraw(pic, (path) g, p); }
		// some geometry
		pair foot(pair P, pair A, pair B) { return foot(triangle(A,B,P).VC); }
		pair orthocenter(pair A, pair B, pair C) { return orthocentercenter(A,B,C); }
		pair centroid(pair A, pair B, pair C) { return (A+B+C)/3; }
		// cse5 abbrevations
		path CP(pair P, pair A) { return circle(P, abs(A-P)); }
		path CR(pair P, real r) { return circle(P, r); }
		pair IP(path p, path q) { return intersectionpoints(p,q)[0]; }
		pair OP(path p, path q) { return intersectionpoints(p,q)[1]; }
		path Line(pair A, pair B, real a=0.6, real b=a) { return (a*(A-B)+A)--(b*(B-A)+B); }
		// cse5 more useful functions
		picture CC() {
			picture p=rotate(0)*currentpicture;
			currentpicture.erase();
			return p;
		}
		pair MP(Label s, pair A, pair B = plain.S, pen p = defaultpen) {
			Label L = s;
			L.s = "$"+s.s+"$";
			label(L, A, B, p);
			return A;
		}
		pair Drawing(Label s = "", pair A, pair B = plain.S, pen p = defaultpen) {
			dot(MP(s, A, B, p), p);
			return A;
		}
		path Drawing(path g, pen p = defaultpen, arrowbar ar = None) {
			draw(g, p, ar);
			return g;
		}
	\end{asydef}
\fi

%%fakesection BEGIN MAIN SETUP
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\ifevansetup
	%%fakesection Set up author and date
	\ifevanauthor
		\title{} % empty title to avoid crashes
		\author{Evan Chen}
		\date{\today}
	\fi
	%%fakesection Hyperref
	\ifevanpkg
		\PassOptionsToPackage{usenames,svgnames,dvipsnames,table}{xcolor}
		\usepackage{xcolor}
		\ifevanhref
			\usepackage[colorlinks=true]{hyperref}
			\hypersetup{urlcolor=RubineRed,linkcolor=RoyalBlue,citecolor=ForestGreen}
		\fi
		\usepackage[nameinlink]{cleveref}
	\fi

	%%fakesection New Theorem Styles
	\ifevanthm
		\usepackage{amsthm}
		\usepackage{thmtools}
	\fi
	\ifevanmdthm
		\ifevanthm
			%% theorem packages loaded already
		\else
			\usepackage{amsthm}
			\usepackage{thmtools}
		\fi
		\usepackage[framemethod=TikZ]{mdframed}

		\mdfdefinestyle{mdbluebox}{%
			roundcorner=10pt,
			linewidth=1pt,
			skipabove=12pt,
			innerbottommargin=9pt,
			skipbelow=2pt,
			linecolor=blue,
			nobreak=true,
			backgroundcolor=TealBlue!5,
		}
		\declaretheoremstyle[
			headfont=\sffamily\bfseries\color{MidnightBlue},
			mdframed={style=mdbluebox},
			headpunct={\\[3pt]},
			postheadspace={0pt}
		]{thmbluebox}

		\mdfdefinestyle{mdredbox}{%
			linewidth=0.5pt,
			skipabove=12pt,
			frametitleaboveskip=5pt,
			frametitlebelowskip=0pt,
			skipbelow=2pt,
			frametitlefont=\bfseries,
			innertopmargin=4pt,
			innerbottommargin=8pt,
			nobreak=true,
			backgroundcolor=Salmon!5,
			linecolor=RawSienna,
		}
		\declaretheoremstyle[
			headfont=\bfseries\color{RawSienna},
			mdframed={style=mdredbox},
			headpunct={\\[3pt]},
			postheadspace={0pt},
		]{thmredbox}

		\mdfdefinestyle{mdgreenbox}{%
			skipabove=8pt,
			linewidth=2pt,
			rightline=false,
			leftline=true,
			topline=false,
			bottomline=false,
			linecolor=ForestGreen,
			backgroundcolor=ForestGreen!5,
		}
		\declaretheoremstyle[
			headfont=\bfseries\sffamily\color{ForestGreen!70!black},
			bodyfont=\normalfont,
			spaceabove=2pt,
			spacebelow=1pt,
			mdframed={style=mdgreenbox},
			headpunct={ --- },
		]{thmgreenbox}

		\mdfdefinestyle{mdblackbox}{%
			skipabove=8pt,
			linewidth=3pt,
			rightline=false,
			leftline=true,
			topline=false,
			bottomline=false,
			linecolor=black,
			backgroundcolor=RedViolet!5!gray!5,
		}
		\declaretheoremstyle[
			headfont=\bfseries,
			bodyfont=\normalfont\small,
			spaceabove=0pt,
			spacebelow=0pt,
			mdframed={style=mdblackbox}
		]{thmblackbox}

		\newcommand{\listhack}{$\empty$\vspace{-2em}}
	\fi

	%%fakesection Theorem setup
	\ifevanthm
		\theoremstyle{definition}
		%Branching here: the option secthm changes theorems to be labelled by section
		\ifevanmdthm
			\ifevansecthm
				\declaretheorem[%
				style=thmbluebox,name=Theorem,numberwithin=section]{theorem}
			\else
				\declaretheorem[%
				style=thmbluebox,name=Theorem]{theorem}
			\fi
			\declaretheorem[style=thmbluebox,name=Lemma,sibling=theorem]{lemma}
			\declaretheorem[style=thmbluebox,name=Proposition,sibling=theorem]{proposition}
			\declaretheorem[style=thmbluebox,name=Corollary,sibling=theorem]{corollary}
			\declaretheorem[style=thmbluebox,name=Theorem,numbered=no]{theorem*}
			\declaretheorem[style=thmbluebox,name=Lemma,numbered=no]{lemma*}
			\declaretheorem[style=thmbluebox,name=Proposition,numbered=no]{proposition*}
			\declaretheorem[style=thmbluebox,name=Corollary,numbered=no]{corollary*}
		\else
			\ifevansecthm
				\declaretheorem[name=Theorem,numberwithin=section]{theorem}
			\else
				\declaretheorem[name=Theorem]{theorem}
			\fi
			\declaretheorem[name=Lemma,sibling=theorem]{lemma}
			\declaretheorem[name=Proposition,sibling=theorem]{proposition}
			\declaretheorem[name=Corollary,sibling=theorem]{corollary}
			\declaretheorem[name=Theorem,numbered=no]{theorem*}
			\declaretheorem[name=Lemma,numbered=no]{lemma*}
			\declaretheorem[name=Proposition,numbered=no]{proposition*}
			\declaretheorem[name=Corollary,numbered=no]{corollary*}
		\fi

		\ifevanmdthm
			\declaretheorem[style=thmgreenbox,name=Algorithm,sibling=theorem]{algorithm}
			\declaretheorem[style=thmgreenbox,name=Algorithm,numbered=no]{algorithm*}
			\declaretheorem[style=thmgreenbox,name=Claim,sibling=theorem]{claim}
			\declaretheorem[style=thmgreenbox,name=Claim,numbered=no]{claim*}
		\else
			\declaretheorem[name=Algorithm,sibling=theorem]{algorithm}
			\declaretheorem[name=Algorithm,numbered=no]{algorithm*}
			\declaretheorem[name=Claim,sibling=theorem]{claim}
			\declaretheorem[name=Claim,numbered=no]{claim*}
		\fi

		\ifevanmdthm
			\declaretheorem[style=thmredbox,name=Example,sibling=theorem]{example}
			\declaretheorem[style=thmredbox,name=Example,numbered=no]{example*}
		\else
			\declaretheorem[name=Example,sibling=theorem]{example}
			\declaretheorem[name=Example,numbered=no]{example*}
		\fi

		% Remark-style theorems
		%\theoremstyle{remark}
		\ifevanmdthm
			\declaretheorem[style=thmblackbox,name=Remark,sibling=theorem]{remark}
			\declaretheorem[style=thmblackbox,name=Remark,numbered=no]{remark*}
		\else
			\declaretheorem[name=Remark,sibling=theorem]{remark}
			\declaretheorem[name=Remark,numbered=no]{remark*}
		\fi

		\declaretheorem[name=Conjecture,sibling=theorem]{conjecture}
		\declaretheorem[name=Conjecture,numbered=no]{conjecture*}
		\declaretheorem[name=Definition,sibling=theorem]{definition}
		\declaretheorem[name=Definition,numbered=no]{definition*}
		\declaretheorem[name=Exercise,sibling=theorem]{exercise}
		\declaretheorem[name=Exercise,numbered=no]{exercise*}
		\declaretheorem[name=Fact,sibling=theorem]{fact}
		\declaretheorem[name=Fact,numbered=no]{fact*}
		\declaretheorem[name=Problem,sibling=theorem]{problem}
		\declaretheorem[name=Problem,numbered=no]{problem*}
		\declaretheorem[name=Question,sibling=theorem]{ques}
		\declaretheorem[name=Question,numbered=no]{ques*}

		\Crefname{claim}{Claim}{Claims}
		\Crefname{conjecture}{Conjecture}{Conjectures}
		\Crefname{exercise}{Exercise}{Exercises}
		\Crefname{fact}{Fact}{Facts}
		\Crefname{problem}{Problem}{Problems}
		\Crefname{ques}{Question}{Questions}
	\fi

	%%fakesection Fancy section and chapter heads
	\ifevancolorsec
		\@ifundefined{KOMAClassName}{}{
			\@ifundefined{chapter}{}{
				\addtokomafont{partprefix}{\rmfamily}
				\renewcommand*{\partformat}{\color{purple}
					\scalebox{2.5}{\thepart}\enlargethispage{2em}}
				\addtokomafont{chapterprefix}{\raggedleft}
				\RedeclareSectionCommand[beforeskip=0.5em]{chapter}
				\renewcommand*{\chapterformat}{\mbox{%
					\scalebox{1.5}{\chapappifchapterprefix{\nobreakspace}}%
					\scalebox{2.718}{\color{purple}\thechapter}\enskip}}
			}
			\renewcommand*{\sectionformat}%
				{\color{purple}\S\thesection\enskip}
			\renewcommand*{\subsectionformat}%
				{\color{purple}\S\thesubsection\enskip}
			\renewcommand*{\subsubsectionformat}%
				{\color{purple}\S\thesubsubsection\enskip}
			\KOMAoptions{numbers=noenddot}
			%\usetocstyle{KOMAlike}
		}
	\fi


	%%fakesection Loads a bunch of useful packages (but allow disabling)
	\ifevanpkg
		\ifevanvonenabled
			\IfFileExists{von.sty}{\usepackage{von}}{}
		\fi
		\usepackage{listings}
		\usepackage{mathrsfs}
		\usepackage{textcomp}
		\lstset{basicstyle=\ttfamily\scriptsize,
			backgroundcolor=\color{green!2!white},
			breakatwhitespace=true,
			breaklines=true,
			commentstyle=\color{green!70!black},
			frame=shadowbox,
			frame=single,
			identifierstyle=\color{green!20!black},
			keywordstyle=\bfseries,
			keywordstyle=\bfseries\color{blue},
			numbers=left,
			numbersep=5pt,
			numberstyle=\tiny\sffamily\itshape\color{black!60},
			rulecolor=\color{blue!70!black},
			rulesepcolor=\color{blue!30!black},
			showstringspaces=false,
			stringstyle=\color{orange},
			tabsize=4,
		} % chktex 6
		\lstdefinelanguage{gitcommit}{
			alsoletter={:},
			morecomment=[l]{|},
			morekeywords={commit,Author:,Date:,chore,doc,edit,feat,fix,polish,style,tests,},
			sensitive=true,
		}
		\lstdefinelanguage{gitlog}{
			morekeywords={chore,doc,edit,feat,fix,polish,style,tests,},
			morecomment=[s]{[}{]}, % chktex 9
			sensitive=true,
		}

		\usepackage[shortlabels]{enumitem}
		\usepackage[obeyFinal,textsize=scriptsize,shadow]{todonotes}
		\usepackage{textcomp}
		\usepackage{multirow}
		% Tiny tiny optimizations:
		\usepackage{mathtools}
		\usepackage{microtype}
		\usepackage{xstring}
		\ifevanbritish
			% Use day-first date format
			\usepackage[cleanlook,british]{isodate}
		\fi

		% a list I like for walkthrough's --- Drew-style parts
		\newlist{walk}{enumerate}{3}
		\setlist[walk]{label=\bfseries (\alph*)}
		% list item for MO style rubrics
		\newcommand{\worth}[1]{\def\hfill{\hskip 20pt plus 1fill}\dotfill%
			\IfEq{#1}{0}{\textbf{0~points}}%
			{\textbf{\color{blue}#1~point\IfEndWith{#1}{1}{}{s}}}%
			\par}
		\newcommand{\subworth}[1]{\def\hfill{\hskip 20pt plus 1fill}\dotfill%
			\IfEq{#1}{0}{{\footnotesize0~points}}%
			{\textbf{\footnotesize#1~point\IfEndWith{#1}{1}{}{s}}}%
			\par}
		\newlist{rubric}{enumerate}{2}
		\setlist[rubric,1]{label=\Roman*.}
		\setlist[rubric,2]{label=(\Roman{rubrici}.\alph*)}
	\fi

	%%fakesection \maketitle configuration
	\@ifundefined{KOMAClassName}%
		{} % do nothing outside KOMA class
		{% If KOMA exists. . .
		\addtokomafont{subtitle}{\Large}
		\setkomafont{author}{\Large\scshape}
		\setkomafont{date}{\Large\normalsize}
		}
	\providecommand{\thetitle}{\@title}
	\providecommand{\theauthor}{\@author}
	\providecommand{\thedate}{\@date}

	%%fakesection Commutative diagrams support
	\ifevandiagrams
		\usepackage{tikz-cd}
		\usetikzlibrary{decorations.pathmorphing}
	\fi

	%%fakesection Page Setup
	\ifevanfancy
		\@ifundefined{KOMAClassName}
		{
			\usepackage{fancyhdr}
			\setlength{\headheight}{0.75in}
			\setlength{\oddsidemargin}{0in}
			\setlength{\evensidemargin}{0in}
			\setlength{\voffset}{-1.0in}
			\setlength{\headsep}{10pt}
			\setlength{\textwidth}{6.5in}
			\setlength{\headwidth}{6.5in}
			\setlength{\textheight}{8.75in}
			\setlength{\parskip}{1ex plus 0.5ex minus 0.2ex}
			\setlength{\footskip}{0.3in}
			\ifevanhdr
				\renewcommand{\headrulewidth}{0.5pt}
				\renewcommand{\footrulewidth}{0.0pt}
				\pagestyle{fancy}
				\lhead{Evan Chen}
				\chead{}
				\rhead{\nouppercase{\leftmark}}
				\lfoot{}
				\cfoot{\thepage}
				\rfoot{}
			\fi
		}
		{
			\usepackage[headsepline]{scrlayer-scrpage}
			\renewcommand{\headfont}{}
			\addtolength{\textheight}{3.14cm}
			\setlength{\footskip}{0.5in}
			\setlength{\headsep}{10pt}
			\ihead{\footnotesize\textbf{\theauthor} (\thedate)}
			\automark{section}
			\chead{}
			\ohead{\footnotesize\textbf{\thetitle}}
			\cfoot{\pagemark}
		}
	\fi

	%%fakesection Chinese support
	\ifevanchinese
		\usepackage[encapsulated]{CJK}
		\usepackage{ucs}
		\usepackage[utf8x]{inputenc}
		\newenvironment{bsmi}{\begin{CJK}{UTF8}{bsmi}}{\end{CJK}}
		\newcommand{\cn}[1]{\begin{bsmi}#1\end{bsmi}}
		\AtBeginDocument{\begin{CJK}{UTF8}{bsmi}}
		\AtEndDocument{\end{CJK}}
	\fi

	%%fakesection Hints
	\ifevanhints
		\usepackage{answers}
		\Newassociation{hint}{hintitem}{hints}
		\renewcommand{\solutionextension}{out}
		\Opensolutionfile{hints}
		\newcommand{\makehints}{\Closesolutionfile{hints}\input{hints.out}} % chktex 27
	\fi
%%fakesection END MAIN SETUP
\fi