Point regular groups of automorphisms of generalised quadrangles

Details Point regular groups of automorphisms of generalised quadrangles Point regular groups of automorphisms of generalised quadrangles

2010-05-13

arxiv.org/abs/1005.2250v2

Mathematics

Combinatorics

some minor changes (including to title) after referee's comments

Scientific paper

We study the point regular groups of automorphisms of some of the known generalised quadrangles. In particular we determine all point regular groups of automorphisms of the thick classical generalised quadrangles. We also construct point regular groups of automorphisms of the generalised quadrangle of order $(q-1,q+1)$ obtained by Payne derivation from the classical symplectic quadrangle $\mathsf{W}(3,q)$. For $q=p^f$ with $f\geq 2$ we obtain at least two nonisomorphic groups when $p\geq 5$ and at least three nonisomorphic groups when $p=2$ or $3$. Our groups include nonabelian 2-groups, groups of exponent 9 and nonspecial $p$-groups. We also enumerate all point regular groups of automorphisms of some small generalised quadrangles.

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