% !TEX program = pdflatexmystyletau
\documentclass{article}
\usepackage{amsmath}
\usepackage{xcolor}
\usepackage{mystyletau} 
\usepackage[margin=2.5cm]{geometry} 
\usepackage{hyperref} 
\hypersetup{
    colorlinks=true,
    linkcolor=blue,
    urlcolor=blue,
    pdftitle={The mystyletau package},
}

\usepackage{titling}
\setlength{\droptitle}{-1.5cm} 

\title{The \texttt{mystyletau} package}
\author{\href{mailto:antonellomeccariello234@gmail.com}{Antonello Meccariello} 
  \& 
  \href{mailto:meccariellofrancesco87@gmail.com}{Francesco Meccariello}%
}
\date{Version 2.1 --- October 2026}

\begin{document}
\maketitle

\section{Introduction}
The \texttt{mystyletau} package introduces two custom glyphs for the letter $\tau$. While the standard notation for a topological space $(X, \tau_X)$ is functional, the authors believe these variants offer superior aesthetic appeal for denoting topologies or algebraic structures.

\section{New in Version 2.1}
Version 2.1 expands engine compatibility to make the package fully universal across all major TeX distribution engines:
\begin{itemize}
    \item \textbf{Universal Engine Support:} Works seamlessly with \texttt{pdflatex}, \texttt{lualatex}, and \texttt{xelatex} without requiring any engine-specific options or conditional code in user documents.
    \item \textbf{Dynamic Engine Detection:} Utilizes the \texttt{iftex} package to transparently switch rendering backends depending on the active compiler.
    \item \textbf{Dual Rendering Backend:} Uses native TrueType font loading (\texttt{mytautwo.ttf} via \texttt{fontspec}) under LuaLaTeX and XeLaTeX, and high-quality vector fallbacks (\texttt{vtau.pdf} and \texttt{atau.pdf}) under pdfLaTeX.
    \item \textbf{Consistent Features:} Preserves auto-scaling in subscripts/superscripts, color support via \texttt{xcolor}, and math/text mode independence across all engines.
\end{itemize}

\section{Usage}
Simply include the package in your preamble:
\begin{verbatim}
\usepackage{mystyletau}
\end{verbatim}

The package works out of the box regardless of whether you compile with \texttt{pdflatex}, \texttt{lualatex}, or \texttt{xelatex}.

The following commands provide access to the custom glyphs:
\begin{itemize}
    \item \verb|\vtau|: \vtau
    \item \verb|\atau|: \atau
\end{itemize}

\section{Examples}
Consider the following statements to compare the visual impact:
\begin{enumerate}
    \item Standard: Let $(X, \tau_X)$ be a topological space.
    \item Variant A: Let $(X, \vtau_X)$ be a topological space.
    \item Variant B: Let \Huge{$ \color{red}(X,\atau_X)$} be a topological space.
\end{enumerate}

\noindent The authors suggest that notations like $(X, \vtau_X)$ and $(X, \atau_X)$ provide a more elegant visual impact compared to the standard Computer Modern $(X, \tau_X)$.

\end{document}