Beiträge zur Algebra und Geometrie Contributions to Algebra and Geometry Vol. 50, No. 2, pp. 483493 (2009) 

Embeddings of projective Klingenberg planes in the projective space PG(5,$\K$)Dirk Keppens and Hendrik Van MaldeghemDepartment of Industrial Engineering, KAHO SintLieven, Gebr. Desmetstraat 1, B9000 Gent, Belgium, email: dirk.keppens@kahosl.be; Department of Pure Mathematics and Computer Algebra, Ghent University, Krijgslaan 281, S22, B9000 Gent, Belgium, email: hvm@cage.ugent.beAbstract: In this paper embeddings of projective Klingenberg planes in a 5dimensional projective space are classified. It is proved that if a PKplane is fully embedded in $\PG(5,\K$), for some skewfield $\K$, then it is either isomorphic to the Desarguesian projective Klingenberg plane (projective Hjelmslev plane for bijective $\sigma$) $\PH(2,\D(\K,\sigma))$ over a ring of ordinary or twisted dual numbers or it is a subgeometry of an ordinary projective plane. As a consequence we have in the finite case that, if a projective Klingenberg plane of order $(qt,t)$ is embedded in PG(5,$q$), then it is a projective Hjelmslev plane $\PH(2,\D(q,\sigma))$ over a ring of ordinary or twisted dual numbers over the Galois field $\GF(q)$. The embeddings related to the twisted case are new. Keywords: projective Klingenberg plane, projective Hjelmslev plane, embedding, dual numbers Classification (MSC2000): 51C05, 51A45 Full text of the article:
Electronic version published on: 28 Aug 2009. This page was last modified: 28 Jan 2013.
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