19-25 June 2011
Bled, Slovenia
Europe/Ljubljana timezone
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Triple intersection numbers in distance-regular graphs

Presented by Mr. Aleksandar JURISIC
Type: Oral presentation
Track: Representations of Graphs


A graph is said to be $t$-tuple regular if, for any set $S$ of vertices with $|S|\le t$, the number of common neighbours of $S$ depends only on the isomorhism type of the induced subgraph on $S$. It follows immediately that a graph is 1-tuple regular iff it is regular, and it is 2-tuple regular iff it is strongly regular. Cameron and Van Lint studied 3-tuple regular graphs, and they characterized them with strongly regular graphs that have strongly regular subconstituents. We generalize their study to distance-regular graphs and investigate triple intersection numbers. Some of the results in this talk are a joint work with Paul Terwilliger and/or Jack Koolen.


Location: Bled, Slovenia
Address: Best Western Hotel Kompas Bled

Primary authors