 \tau _m \int _{\varOmega } | \nabla u_h |^0 \, \rho ^m \, | \nabla \phi ^m |. \end{aligned}$$\end{document}$$If we choose $\documentclass[00pt]{minimal}                 \usepackage{amsmath}                 \usepackage{wasysym}                  \usepackage{amsfonts}                  \usepackage{amssymb}                  \usepackage{amsbsy}                 \usepackage{mathrsfs}                 \usepackage{upgreek}                 \setlength{\oddsidemargin}{-00pt}                 \begin{document}$$\tau _0>0$$\end{document}$ s