Lecturer: GuoYubao

Abstract:

For a positive integerc, a digraph is semicompletec-partite if it is obtained from a completec-partite graph by replacing every edge by an arc or two opposite arcs. We consider the cycle structure, especially, quasi_l-, quasi_p- and quasi_o-vertex-pancyclicity of semicompletec-partite digraphs.

In this talk, we will also give an overview of semicomplete multipartite digraphs and leave some open problems.

Introduction to the Lecturer:

Guo Yubao is a professor and doctoral supervisor from RWTH Aachen University, Germany. In 1991, 1995 and 1999, he successively obtained the degree of master of science, doctoral degree and teaching qualification of RWTH Aachen University in Mathematics. Since 2006, he has been a tenured professor from the Department of Mathematics, RWTH Aachen University and the first Chinese professor of the University.

His main research includes graph theory, discrete optimization and its algorithms. He has deeply studied the directed graphs, especially tournament, locally semi-complete digraphs, semi-complete multipartite digraphs and super tournament, and made some important and influential achievements. He has issued more than 60 high-level academic papers, published monographs, and trained many doctors at home and abroad. He is keen on academic, cultural and technical exchange between China and Germany. He is a visiting professor of Southeast University and Shanxi University. In addition, he has participated in the academic cooperation projects between RWTH Aachen University and many colleges and universities in China, and promoted the establishment of friendly relationship between them.

Invitee:

Yan Jin, Professor from School of Mathematics

Time:

19:00, December 6 (Monday)

Venue:

Zoom account: 86022696421, password: 332863

Hosted by the School of Mathematics, Shandong University