组合数学讨论班

报告题目: Constructions of distance biregular graphs

报 告 人: Professor Akhiro Munemasa (Tohoku University)

时      间: 10:00-11:00, September 18, 2025

地     点：820 Haina Complex Building 2

摘     要: We construct a new family of distance-biregular graphs related to hyperovals and a new sporadic example of a distance-biregular graph related to Mathon's perp system. The infinite family can be explained using 2-Y- homogeneity, while the sporadic example belongs to a generalization of a construction by Delorme. Additionally, we give a new non-existence criteria for distance-biregular graphs. This is joint work with Blas Fernández, Ferdinand Ihringer and Sabrina Lato.