Rob Sullivan

collaborators

2 papers

math.LO2026

An unusual example of a universal automorphism group

Rob Sullivan, Jeroen Winkel

Let $M$ be a Fraïssé structure (a countably infinite ultrahomogeneous structure). We refer to the class of structures embeddable in $M$ as the $ω$ -age of $M$ . We consider the follo…

math.LO2026

Determining the normal subgroups of the automorphism groups of ultrahomogeneous structures via stabilisers

Thomas Bernert, Rob Sullivan, Jeroen Winkel +1

We show the simplicity of the automorphism groups of the generic $n$ -hypertournament and the semigeneric tournament, and determine the normal subgroups of the automorphism groups o…