应学院邀请，山东大学孙华清教授将在线作学术报告。
报告题目：On essential spectra of singular Hamiltonian systems
报告摘要：This talk is concerned with essential spectra of Hamiltonian systems with one singular endpoint. The characterization of each element of the essential spectrum in terms of certain singular sequences is given, the concept of perturbation small at the singular endpoint is introduced, and the stability of the essential spectrum is obtained under this perturbation. Some sufficient conditions for the invariance of the essential spectrum are given in terms of coefficients of Hamiltonian systems.
报告时间：2022年7月6日上午9:00
报告地点：腾讯会议 542-158-197
邀 请 人：高承华教授
届时欢迎广大师生参与交流！
报告人简介
孙华清，山东大学教授、博导，一直从事奇异微分与差分算子谱理论研究，在J.Funct.Anal., J. Differential Equations, Math.Nachr. Proc. Roy. Soc. Edinburgh Sect.A，等国际权威杂志上发表27篇SCI收录的论文，先后主持国家自然科学基金3项，其它省部级项目多项。
