Here, the anisotropic \begin{document}$ (p, q) $\end{document}-Laplacian style='text-indent:20px;'> \begin{document}$ - \sum\limits_{i = 1}^N\frac{\partial}{\partial x_i}\left( \left|\frac{\partial u}{\partial x_i}\right|^{p_i-2}\frac{\partial x_i}\right) x_i}\ri...