# Gregory Robson: On bi-coset (di)graphs and their automorphism groups

Date of publication: 22. 3. 2024

Discrete mathematics seminar

Tuesday

26

March

Time:

10:15

Location:

Plemljev seminar, Jadranska 19

**Povzetek/Abstract**: Bi-coset graphs, introduced by Du and Xu in 2000, serve as a comprehensive description for all semi-transitive graphs. Bi-coset (di)graphs can be thought of as extensions of Haar (di)graphs, also known as bi-Cayley (di)graphs. The focus of this discussion is to find strong constraints on the automorphism groups associated with bi-coset (di)graphs. In simpler terms, we aim to better understand the inherent structures and symmetries of these (di)graphs.