Combinatorics Seminar 2017

Speaker: Peter Cameron, University of St Andrews

Date: Fri, Nov 17, 2017

Time: 10:10 - 11:10

Venue: Middle Meeting Room

Title: Permutation groups and transformation semigroups (III)


A semigroup is regular if every element has a von Neumann inverse. Those permutation groups having the property that the semigroup generated by the group together with any non-permutation of the domain is regular, have been classified. Currently this is being extended by restricting the non-permutation to have given rank, or to have a given image.

Slides: View slides