\documentclass[a4paper]{article}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{multicol}
\usepackage{ragged2e}
\usepackage{blindtext}
\usepackage[english]{babel} %this is the dictionary you will use
\usepackage{graphicx,mathdots,chemarr,fancyvrb,comment} %some more packages
\usepackage{tikz} %some more packages
%the packages from here on will help with creating a graph
%tikzpicture
\usepackage{scalerel}
\usepackage{pict2e}
\usepackage{tkz-euclide}
\usepackage{scalerel}
\usepackage{pict2e}
\usepackage{tkz-euclide}
\usepackage{listings}
\usepackage{color}
\usepackage{tcolorbox}
\usepackage{xifthen}
\definecolor{dkgreen}{rgb}{0,0.6,0}
\definecolor{gray}{rgb}{0.5,0.5,0.5}
\definecolor{mauve}{rgb}{0.58,0,0.82}
\makeatletter
\newcommand{\mnewline}{\newline\newline\newline}
\newcommand{\mline}{\rule{0.5cm}{0.5pt}}
\newcommand{\proj}[1]{\text{Proj}_{#1}}
\newcommand{\st}{\ni:}
\newcommand{\evaline}[2]{\Big|^{#1}_{#2}}
\newcommand{\nulli}[1]{\text{Null }{#1}}
\newcommand{\ran}[1]{\text{ran }{#1}}
\newcommand{\col}[1]{\text{Col }({#1})}
\newcommand{\re}[1]{\text{Re}({#1})}
\newcommand{\im}[1]{\text{Im}({#1})}
\newcommand{\spa}[1]{\text{span}\{{#1}\}}
%\newcommand{\neproof}[3]{$\text{Let } \epsilon > {#2} \text{ be given}$\\\text{Choose $N = {#1}$\text{ Suppose $n > N  > {#3}$}}}
\newcommand{\neproof}[3]{ %The first one is without the 3rd argument and the second one is
	\ifthenelse{\isempty{#3}}{$\text{Let } \epsilon > {#2} \text{ be given}$\\\text{Choose $N = {#1}$\text{ Suppose $n > N$}}}
	{$\text{Let } \epsilon > {#2} \text{ be given}$\\\text{Choose $N = {#1}$\text{ Suppose $n > N  > {#3}$}}} 
}
\renewcommand*\env@matrix[1][*\c@MaxMatrixCols c]{%
	\hskip -\arraycolsep
	\let\@ifnextchar\new@ifnextchar
	\array{#1}}
\makeatother
\usepackage[letterpaper,left=6mm,includemp=true,marginparwidth=12mm,marginparsep=1mm,reversemarginpar,right=19mm,
includefoot=true,top=19mm,nohead,footskip=12mm,bottom=6mm]{geometry}
% Here are the custom commands I have created. They are increadibly retarded
% mnewline: creates 3 newlines
% mline: Creates a horizontal line
% proj: Creates a Proj with a suitable subscript - Takes an argument
% st: creates a ni and a : as the 'such that'
% evaline: creates a vertical line for evaluated definite integrals. First argument is upper limit, second is lower. - Takes two arguments
% nulli: creates a Null (with a whitespace) - Takes an argument
% col: creates a Col (with a whitespace) - Takes an argument
% ran: creates a ran (with a whitespace) - Takes an argument
% re: creates a Re() - Takes an argument
% im: creates a Im() - Takes an argument
% sp: creates a span{} - Takes an argument
% neproof: Creates a cookie cutter N-epsilon proof. First argument set's N's value and second argument sets epsilon greater than value and the third (optional) argument sets the n > N > value. IF YOU DO NOT WANT THE THIRD ARGUMENT YOU NEED AN EMPTY CURLY BRACKET
\begin{document}
	\setlength{\parindent}{1cm}
	Q1\newline
	\mnewline
\end{document}
