On the inducibility of oriented graphs on four vertices

• DOI: 10.1016/j.disc.2022.112874
• Publication Date: 2022-03-08T12:37:54Z
• Authors: Łukasz Bożyk; Andrzej Grzesik; Bartłomiej Kielak
• Keywords: 05C35 (Primary), 05C20 (Secondary); FOS: Mathematics; Mathematics - Combinatorics; Combinatorics (math.CO); 0102 computer and information sciences; 0101 mathematics; 01 natural sciences

Added appendices on usage of updated codes and verification of the certificates<br/>We consider the problem of determining the inducibility (maximum possible asymptotic density of induced copies) of oriented graphs on four vertices. We provide exact values for more than half of the graphs, and very close lower and upper bounds for all the remaining ones. It occurs that, for some graphs, the structure of extremal constructions maximizing density of its induced copies is very sophisticated and complex.<br/>