note.cls

% -- Provides the math notes class "note"
% -- based on https://gist.github.com/jhwilson/1278588
%
% This package replicates, to the best of my ability, the look of my
% hand-written notes.

\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{note}[2018/10/27 Mathematical Notes, Siddharth Mahendraker]

\LoadClass[a4paper,12pt]{article}

\RequirePackage{fancyhdr}
\RequirePackage[top=1in,bottom=1in,left=1in,right=1in]{geometry}

\setlength{\headheight}{15pt}
\lhead{\@author}\chead{\@title}\rhead{\@date}
\lfoot{}\cfoot{\thepage}\rfoot{}
\pagestyle{fancy}

\newenvironment{exercise}[1]%
{\makebox[0pt][r]{\textbf{#1}\;}\begin{minipage}[t]{\textwidth}}%
{\end{minipage}\hspace{1em}}

\newenvironment{pf}%
{\makebox[0pt][r]{\textit{Proof:}\;}\begin{minipage}[t]{\textwidth}}%
{\hfill\qedsymbol\end{minipage}\hspace{1em}}