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+\documentclass{article}
+
+\usepackage{fouriernc}
+\usepackage[utf8]{inputenc}
+\usepackage{nl-interval}
+\usepackage{indentfirst}
+\usepackage{fancyvrb}
+\usepackage{siunitx}
+
+\title{The {\bf nl-interval} package}
+\author{Antero Neves}
+\date{12 March 2021 \quad version 1.0}
+
+\begin{document}
+	\maketitle
+	
+	\begin{abstract}
+	This is a \LaTeX\ package that aims to simplify and agilize the process of representing intervals in the real axis. 
+	Four commands are provided: \verb*|\nlAxisX|, \verb*|\nlnuminf|, \verb*|\nlinfnum| and \verb*|\nlnumnum|, they were built around the packages {\bf tkz-fct}, {\bf ifthen} and {\bf xparse} and require being used inside a \verb*|tikzpicture| environment.
+	\end{abstract}
+	
+	
+	\section{How to use}
+	
+	\subsection{How to load the package}
+	
+	The package is loaded as usual, through the command 
+	
+	\medskip
+	
+	\verb*|\usepackage{nl-interval}|
+	
+	\medskip
+	
+	There are, at this time, no options available to include here.
+	
+	\subsection{The commands}
+	
+	The first command is \verb*|\nlAxisX| and it simply draws the \(x\) axis where the intervals are going to be represented. It has two mandatory inputs: the minimum and maximum of the axis, so, the full instruction is: \Verb*|\nlAxisX{min}{max}|:
+	
+
+	\begin{Verbatim}[gobble=1,xleftmargin=5mm]
+	\begin{tikzpicture}
+		\nlAxisX{-2}{5}
+	\end{tikzpicture}	
+	\end{Verbatim}
+
+	
+	would give the output:
+	
+	\medskip
+	
+	\begin{center}
+		\begin{tikzpicture}
+			\nlAxisX{-2}{5}
+		\end{tikzpicture}
+	\end{center}
+
+
+	After the axis is drawn, one can start placing the intervals. To do this we will consider two kinds of intervals, the ones with infinity, either \(-\infty\) or \(+\infty\) and the ones with two numbers.
+	
+	\newpage
+	
+	
+	Let's start with the first group.
+	
+	\begin{itemize}
+		\item \verb*|\nlinfnum| will draw intervals of the kind: \(\left]-\infty, number\right]\) or \(\left]-\infty, number\right[\).
+		\item \verb*|\nlnuminf| will draw intervals of the kind: \(\left[number, +\infty\right[\) or \(\left]number, +\infty\right[\).
+	\end{itemize}
+
+	These two commands also have two mandatory inputs: first one is the number ({\it always a decimal representation, so, something like \(\pi\) doesn't work but there is a workaround!}) and the second if it's an \underline{o}pen or \underline{c}losed interval at the number. So, for instance
+	
+	\medskip
+	
+	\begin{Verbatim}[gobble=1,xleftmargin=5mm]
+	\begin{tikzpicture}
+		\nlAxisX{-2}{5}
+		\nlnuminf{3}{o}
+		\nlinfnum{1}{c}
+	\end{tikzpicture}	
+	\end{Verbatim}
+	
+	gives us
+	
+	\medskip
+
+	
+	\begin{center}
+		\begin{tikzpicture}
+			\nlAxisX{-2}{5}
+			\nlnuminf{3}{o}
+			\nlinfnum{1}{c}
+		\end{tikzpicture}
+	\end{center}
+	
+	This time, there are a few optional inputs, the full commands are like this:
+	
+	\begin{Verbatim}[gobble=1,xleftmargin=5mm]
+		\nlnuminf[1]{number}[2]{o or c}[3]
+		\nlinfnum[1]{number}[2]{o or c}[3]
+	\end{Verbatim}
+
+	\begin{itemize}
+		\item in [1] you can put options like different colours or patters used;
+		\item in [2] you can substitute the number for a letter or an exact representation of the number, don't put it in math environment!;
+		\item in [3] you can change the height of the interval, which is \(0.5\si{\centi\meter}\) by default.
+	\end{itemize}
+
+
+	Let's try some of these options:
+	
+	\begin{Verbatim}[gobble=1,xleftmargin=5mm]
+	\begin{tikzpicture}
+		\nlAxisX{-2}{5}
+		\nlnuminf[pattern=north west lines]{1.4142}[\sqrt{2}]{c}[.7]
+		\nlinfnum[red!20]{3.1416}[\pi]{o}
+	\end{tikzpicture}	
+	\end{Verbatim}
+	
+	
+	\begin{center}
+		\begin{tikzpicture}
+			\nlAxisX{-1}{4}
+			\nlnuminf[pattern=north west lines]{1.4142}[\sqrt{2}]{c}[.7]
+			\nlinfnum[red!20]{3.1416}[\pi]{o}
+		\end{tikzpicture}
+	\end{center}
+
+
+\newpage
+	
+The second group of intervals, works with a single command:
+
+\begin{itemize}
+	\item \verb*|\nlnumnum|
+\end{itemize}
+
+and, since it uses two numbers, we have four mandatory inputs: the numbers and the instruction of closed or open. It works like this:
+
+
+\begin{Verbatim}[gobble=1,xleftmargin=5mm]
+	\begin{tikzpicture}
+		\nlAxisX{-2}{5}
+		\nlnumnum{-1}{o}{3}{c}
+	\end{tikzpicture}
+\end{Verbatim}
+	
+	\begin{center}
+		\begin{tikzpicture}
+			\nlAxisX{-2}{5}
+			\nlnumnum{-1}{o}{3}{c}
+		\end{tikzpicture}
+	\end{center}
+	
+As with the previous commands, there are a few options, this time we have one more which allows us to change what is shown in the second number:
+
+
+\begin{Verbatim}[gobble=1,xleftmargin=5mm]
+	\begin{tikzpicture}
+		\nlAxisX{-2}{5}
+		\nlnumnum[red!20]{-1.4142}[-\sqrt{2}]{o}{3.1416}[\pi]{c}
+	\end{tikzpicture}
+\end{Verbatim}
+
+
+\begin{center}
+	\begin{tikzpicture}
+	\nlAxisX{-2}{5}
+	\nlnumnum[red!20]{-1.4142}[-\sqrt{2}]{o}{3.1416}[\pi]{c}
+\end{tikzpicture}
+\end{center}
+
+
+\section{Conclusion}
+
+This is a really simple package (my first attempt at a package) but one that, I hope, can help you draw stuff like:
+
+\begin{center}
+	\begin{tikzpicture}
+		\nlAxisX{-2}{5}
+		\nlnumnum[red!20]{-1.4142}[-\sqrt{2}]{o}{3.1416}[\pi]{c}
+		\nlnuminf[pattern=north west lines]{1.4142}[\sqrt{2}]{c}[.7]
+		\nlinfnum{2}{o}[.3]
+	\end{tikzpicture}
+\end{center}
+
+somewhat quickly and easily. By the way, the instructions for this are:
+
+\begin{Verbatim}[gobble=1,xleftmargin=5mm]
+	\begin{tikzpicture}
+		\nlAxisX{-2}{5}
+		\nlnumnum[red!20]{-1.4142}[-\sqrt{2}]{o}{3.1416}[\pi]{c}
+		\nlnuminf[pattern=north west lines]{1.4142}[\sqrt{2}]{c}[.7]
+		\nlinfnum{2}{o}[.3]
+	\end{tikzpicture}
+\end{Verbatim}
+
+
+\end{document}
+\ No newline at end of file