\RequirePackage[T1]{fontenc}
\RequirePackage[palatino, helvetica, courier, maths = palatino]{mdwfonts}
\RequirePackage{amssymb}
-\usepackage[all, arc, dvips]{xy}
+\RequirePackage[all, arc, dvips]{xy}
\RequirePackage[colour]{mdwtab}
+\makeatletter
%%% maths
\let\epsilon\varepsilon