\documentclass[12pt]{article} \usepackage{mtgreek} \begin{document} \[ \Gamma \Delta \Theta \Lambda \Xi \Pi \Sigma \Upsilon \Phi \Psi \Omega \] \italicupcasegreek \[ \Gamma \Delta \Theta \Lambda \Xi \Pi \Sigma \Upsilon \Phi \Psi \Omega \] \uprightupcasegreek \[ \Gamma \Delta \Theta \Lambda \Xi \Pi \Sigma \Upsilon \Phi \Psi \Omega \] \end{document}