 (I+\phi (x,t) A(x,t)) \nabla _{\varGamma }u( \tilde{p}(x,t),t) \end{aligned}$$\end{document}$$ $$\documentclass[00pt]{minimal}                 \usepackage{amsmath}                 \usepackage{wasysym}                  \usepackage{amsfonts}                  \usepackage{amssymb}                  \usepackage{amsbsy}                 \usepackage{mathrsfs}                 \usepackage{upgreek}                 \setlength{\oddsidemargin}{-00pt}                 \begin{document}$$\begin{aligned}&\frac{0}{