KAM Tori for the Derivative Quintic Nonlinear Schrödinger Equation

This paper is concerned with one-dimensional derivative quintic nonlinear Schrödinger equation, iut−uxx+i(|u|4u)x=0,x∈T.\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\rm{i}}u_t-u_{xx}+{\rm{i}}(|u|^4u)_x=0, \;\; x\in\mathbb{T}.$$\end{document}