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Partial geometries pg (s, t, 2) with an abelian Singer group and a characterization of the van Lint-Schrijver partial geometry

Research paper by S. De Winter

Indexed on: 11 Jul '06Published on: 11 Jul '06Published in: Journal of Algebraic Combinatorics



Abstract

Let \({\mathcal{S}}\) be a proper partial geometry pg(s,t,2), and let G be an abelian group of automorphisms of \({\mathcal{S}}\) acting regularly on the points of \({\mathcal{S}}\). Then either t≡2±ods+1 or \({\mathcal{S}}\) is a pg(5,5,2) isomorphic to the partial geometry of van Lint and Schrijver (Combinatorica 1 (1981), 63–73). This result is a new step towards the classification of partial geometries with an abelian Singer group and further provides an interesting characterization of the geometry of van Lint and Schrijver.