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+% montgomery.cls
+%   https://git.benjidial.net/latex-classes
+% Written by Benji Dial, 2024
+% Released under CC0 1.0
+%   https://creativecommons.org/publicdomain/zero/1.0/
+
+\ProvidesClass{montgomery}
+\LoadClass{book}
+
+\usepackage{amssymb}
+\usepackage{geometry}
+\usepackage{enumitem}
+\usepackage{amsthm}
+\usepackage[svgnames]{xcolor}
+\usepackage{thmtools}
+\usepackage{unicode-math}
+\usepackage{pdftexcmds}
+\usepackage[skins,breakable]{tcolorbox}
+\usepackage{hyperref}
+\usepackage[capitalize]{cleveref}
+\usepackage{rotating}
+\usepackage{environ}
+
+\setmainfont{CMU Sans Serif}
+\setmathfont{Concrete Math}
+
+\makeatletter
+
+\newcommand{\barcolor}[1]{%
+  \ifnum\pdf@strcmp{#1}{definition}=0
+    DarkBlue%
+  \else\ifnum\pdf@strcmp{#1}{example}=0
+    DarkGreen%
+  \else\ifnum\pdf@strcmp{#1}{exercise}=0
+    OrangeRed%
+  \else\ifnum\pdf@strcmp{#1}{theorem}=0
+    Maroon%
+  \else\ifnum\pdf@strcmp{#1}{suggestion}=0
+    MediumVioletRed%
+  \fi\fi\fi\fi\fi
+}
+
+\newcommand{\myenvir}{\@currenvir}
+
+\renewenvironment{proof}[1][\proofname]{
+  \par\pushQED{\qed}\normalfont
+  \relax{\itshape \bfseries #1\@addpunct{.}}\hspace\labelsep\ignorespaces
+}{\popQED\par}
+
+\newcounter{solution}
+
+\newcommand{\solutions}{\setcounter{solution}{0}}
+
+\newcommand{\addsolution}[1]{
+  \g@addto@macro\solutions{
+    \stepcounter{solution}
+    \begin{proof}[\cref{solution-\thesolution-exercise}]
+      \par
+      \label{solution-\thesolution}
+      #1
+    \end{proof}
+  }
+}
+
+\newenvironment{solution}{%
+  \stepcounter{solution}
+  \label{solution-\thesolution-exercise}
+  \par
+  \textit{Solution: Page \pageref{solution-\thesolution}.}
+  \Collect@Body\addsolution
+}{}
+
+\makeatother
+
+\declaretheoremstyle[
+  spaceabove=0pt,
+  spacebelow=0pt,
+  headfont=\bfseries,
+  notefont=\mdseries,
+  bodyfont=\mdseries,
+  notebraces={(}{)},
+  preheadhook={
+    \edef\mycolor{\barcolor{\myenvir}}
+    \begin{tcolorbox}[
+      enhanced,
+      frame hidden,
+      interior hidden,
+      borderline west={2pt}{0pt}{\mycolor},
+      left*=\topsep,
+      right*=0pt,
+      top=0pt,
+      bottom=0pt,
+      parbox=false,
+      breakable
+    ]
+  },
+  postfoothook={
+    \end{tcolorbox}
+  }
+]{boxedthm}
+
+\declaretheorem[style=boxedthm,numbered=no]{definition}
+\declaretheorem[style=boxedthm,numbered=no]{example}
+\declaretheorem[style=boxedthm,parent=chapter]{exercise}
+\declaretheorem[style=boxedthm,parent=chapter]{theorem}
+\declaretheorem[style=boxedthm,numbered=no]{suggestion}
+
+\setlist[itemize]{itemsep=0pt,topsep=0pt}
+\setlist[enumerate]{itemsep=0pt,topsep=0pt,label=\alph*)}
+\setlist[enumerate,2]{label=\roman*)}
+
+\DeclareMathOperator{\arity}{arity}
+\DeclareMathOperator{\free}{free}
+
+\AtBeginDocument{
+  \setlength{\parskip}{\topsep}
+  \setlength{\parindent}{0pt}
+}