%% 
%%  Example 01-17-2 
%%  Copyright (C) 2017 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{110.31393pt}
\usepackage[T1]{fontenc}
%StartShownPreambleCommands
\usepackage{bm,upgreek}
\makeatletter
\newcommand\bfgreek[1]{\bm{\@nameuse{up#1}}}
\makeatother
%StopShownPreambleCommands
\begin{document}
$\bfgreek{beta}\bfgreek{mu}\bfgreek{delta}
 \bfgreek{theta}\bfgreek{sigma}$
\end{document}
