adding some stuff needed for the theory block

src/musrgui/latex_images/abragam.tex

@@ -0,0 +1,9 @@
+\documentclass[12pt]{article}
+\pagestyle{empty}
+\begin{document}
+
+\begin{displaymath}
+\exp\left[ -(\sigma/\gamma)^2 \left( e^{-\gamma t} - 1 + \gamma t\right) \right]
+\end{displaymath}
+
+\end{document}