The twisted Grassmann graph is the block graph of a design

Details The twisted Grassmann graph is the block graph of a design The twisted Grassmann graph is the block graph of a design

2009-06-24

arxiv.org/abs/0906.4509v2

Mathematics

Combinatorics

5 pages. A section on the automorphism group has been added

Scientific paper

In this note, we show that the twisted Grassmann graph constructed by van Dam
and Koolen is the block graph of the design constructed by Jungnickel and
Tonchev. We also show that the full automorphism group of the design is
isomorphic to the full automorphism group of the twisted Grassmann graph.

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