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\documentclass{beamer}
% Quick example of overheads, using the sample beamer description at
% http://www.miwie.org/presentations/presentations.html#beamer
\usepackage{feyn}
\title{Feynman diagrams}
\author{Norman Gray\\University of Glasgow}
\date{v0.4.1, 2017 November 03}
%\parindent0pt
\begin{document}
\frame{\titlepage}
\section{A diagram}
\frame
{
Here is a text diagram $\Feyn{fglf}$, and a displayed one:
\[
\Diagram{\vertexlabel^a \\ fd \\ & g\vertexlabel_{\mu,c} \\
\vertexlabel_b fu\\}
= \displaystyle
ig\gamma_\mu (t^c)_{ab}
\]
}
\end{document}
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