應學院邀請，山東大學孫華清教授将在線作學術報告。
報告題目：On essential spectra of singular Hamiltonian systems
報告摘要：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.
報告時間：2022年7月6日上午9:00
報告地點：騰訊會議 542-158-197
邀 請 人：高承華教授
屆時歡迎廣大師生參與交流！
報告人簡介
孫華清，山東大學教授、博導，一直從事奇異微分與差分算子譜理論研究，在J.Funct.Anal., J. Differential Equations, Math.Nachr. Proc. Roy. Soc. Edinburgh Sect.A，等國際權威雜志上發表27篇SCI收錄的論文，先後主持國家自然科學基金3項，其它省部級項目多項。
