Gabriel Verret: Oligomorphic Permutation Groups

Sreda, 12. novembra 2008, ob 10. uri v Plemljevem seminarju, Jadranska 19/III.

Abstract : A permutation group on an infinite set is oligomorphic if the
number of orbits on ordered n-tuples is finite for all positive integers
n. We will discuss briefly some results on which sequences of integers can be realised as sequences counting orbits of an oligomorphic group on n-tuples or n-sets.