torek, 7. junij 2011 Raziskovalni matematični seminar

V ponedeljek, 13. junija 2011, bo ob 10. uri v seminarski sobi v Galebu, v okviru raziskovalnega matematičnega seminarja, predaval dr. Ilya Ponomarenko (Petersburg Department of V.A.Steklov Institute of Mathematics, St. Petersburg, Russia)

Vljudno vabljeni k udeležbi na predavanju!

Title: On quasi-thin association schemes (joint with M.Muzychuk)

Abstract: An association scheme is called quasi-thin if the valency of each its basic relation is one or two. A quasi-thin scheme is Kleinian if its thin residue is the Klein four-group with respect to relational product.
It turns out that any Kleinian scheme arises from near-pencil on 3 points, or affine or projective plane of order 2. The main esult is that any non-Kleinian quasi-thin scheme is the two-orbit scheme of a suitable permutation group.