\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}