# Noon lecture

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On 2.4.2012 at 12:20 in S6, there is the following noon lecture:

# GI graphs and their groups

## Tomaž Pisanski

## University of Ljubljana

## Abstract

We consider the class of GI-graphs, which is a generalization over the class of the generalized Petersen graphs. The GI-graph GI(n;j_1,j_2,....,j_t) is a (t+1)-valent graph on the vertex set Z_t times Z_n with edges of two kinds:

* edges from (s,v) to (s',v) for all s,s' in Z_t and for every v in Z_n,

* edges from (s,v) to (s,v + j_s) and (s,v - j_s) for all s and v.

We present some results concerning automorphisms of GI-graphs. This is a joint work in progress with Marston Conder and Arjana Žitnik.

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