```tex
\documentclass{report}

\usepackage{xspace}
\newcommand{\dadi}{$\partial$a$\partial$i\xspace}

\begin{document}
\title{\dadi manual\\\normalsize $Revision$}
\author{Ryan Gutenkunst}
\maketitle

\end{document}```

Update for nicer revision information
user
```tex
\documentclass{report}

\usepackage{xspace}
\newcommand{\dadi}{$\partial$a$\partial$i\xspace}

\begin{document}
\title{\dadi manual\\\normalsize  $$Revision$$}
\author{Ryan Gutenkunst}
\maketitle

\end{document}```
assistant