Birkhoff Normal Form for the Derivative Nonlinear Schr?dinger Equation

• 作者: Jian Jun LIU
• 来源期刊: 数学学报（英文版）
• 年，卷（期）: 2022,（1）
• 页码范围: 249-262
• 页数: 14页
• 语种: 英文

摘要

This paper is concerned with the derivative nonlinear Schr?dinger equation with periodic boundary conditions.We obtain complete Birkhoff normal form of order six.As an application,the long time stability for solutions of small amplitude is proved.