報 告 人：孫華清 教授

報告題目：Classification and Weyl functions of a class of singular matrix differential equations of mixed- order

報告時間：2024年12月16日（周一）下午4點

報告地點：靜遠樓1508會議室

主辦單位：數學與統計學院、數學研究院、科學技術研究院

報告人簡介：

       孫華清，東北大學教授，博士生導師，微分方程及其應用遼寧省教育廳重點實驗室主任，遼寧省數學會數學交叉與應用委員會主任，遼寧省首席科學傳播專家，沈陽市領軍人才。從事奇異微分與差分算子譜理論研究，在“J. Funct. Anal.”，“J. Differential Equations”，“Proc. Roy. Soc. Edinburgh Sect. A”，“Stud. Math. Appl.”等國際權威雜志上發表和接受30多篇。曾主持完成國家自然科學基金項目和省部級項目多項，參與國家級和省級項目多項。

報告摘要：

        This paper is concerned with a class of singular matrix differential operators of mixed-order.

Boundary triples and Weyl functions for abstract linear relations are defined, and some properties are presented. Then, the corresponding maximal and minimal operators are defined, and the adjoint relationships between them are proved. In particular, the limit point and limit circle classification of these differential expressions are given. Based on the above results, Weyl functions of this class of singular matrix differential operators of mixed-order are obtained.