主题:On a special two-dimensional lattice by Blaszak and Szum: matrix integral solutions 时间:2023年4月20号10:00-11:30 地点:腾讯会议:662-376-168 主持人:杨军 副教授 报告人简介: 虞国富,2007年6月博士毕业于中国科学院数学与系统科学研究院;加拿大蒙特利尔大学博士后。现为上海交通大学数学科学学院教授、博士生导师,副院长。主要从事孤立子与可积系统、特殊函数、正交多项式方面的研究。在国外重要学术刊物上发表SCI论文50余篇。主持国家自然科学基金、上海市晨光计划、上海交通大学晨星青年学者奖励计划等多项研究课题。 讲座简介: In this talk, we study a special two-dimensional lattice equation proposed by Blaszak and Szum. In the first part, we present matrix integral solutions to the lattice equation and its pfaffianized version. In the second part, we derive solitons, breathers and rational solutions to the lattice equation both on the constant and periodic background. These solutions are given in terms of determinants. In particular, we find three types of breather solutions, including Kuznetsov-Ma breather, Akhmediev breather and general one. By introducing two differential operators applied to the soliton solutions, we obtain rational solutions in terms of Schur polynomials. We demonstrate that rational solutions can exhibit algebraic solitons and lump solitons. By taking higher-order differential operators, we present multiple and higher-order rational solutions. The dynamical behaviors of these obtained solutions are illustrated and analyzed. 关于活动获得“第二课堂学分”的说明(线上): ①腾讯会议:进入腾讯会议后更改自己昵称备注为学号+姓名 ②讲座开始后 将在任意两个时段由工作人员记录信息,进行比对审核,成功匹配的计算第二课堂积分。 ③请同学们全程参与讲座,不可中途来回进出。聆听讲座时确保自己的昵称更改为要求格式,否则最终审核不通过,将无法获得第二课堂积分。