Algebraic Graph Theory International Webinar (13.6.2023)

v utorok 13.6.2023 o 19:00 hod.

12. 06. 2023 10.35 hod.
Od: Róbert Jajcay

The organizers of the Algebraic Graph Theory International Webinar would like to invite you to join us and other colleagues on June 13, 2023, at 7pm Central European Summer Time (= 5pm UTC, please note that we switched to summer time), for the next presentation delivered by Grigory Ryabov. 

The title: Schurity problem for S-rings: overview and new results


Every permutation group induces in a natural way a coherent configuration. Moreover, many concepts from the permutation group theory can be transferred to the coherent configuration theory. However, not every coherent configuration is induced by a suitable permutation group. This is the reason why the coherent configuration theory is sometimes called ``group theory without groups''. A coherent configuration is called schurian if it is induced by a suitable permutation group. Finding a border between schurian and nonschurian coherent configurations (schurity problem) presents one of the most fundamental problems in this theory. The talk will be devoted to the schurity problem for S-rings (Schur rings) which can be considered as a special important case of coherent configurations.


The Zoom link for this semester is:
Meeting ID: 871 9332 0713
Passcode: 653250

Further details may be found at

where you can also find the slides and the recordings of our previous presentations. Also, if you wish to advertise an AGT friendly conference on this page, please send us the link.  

Hoping to see you at the webinar, and wishing you all the best. 

Isabel HubardRobert Jajcay and Primoz Potocnik