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Classification of Embeddings of the Flag Geometries of Projective Planes in Finite Projective Spaces, Part 1

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The flag geometry Γ=(, ℒ, I) of a finite projective plane Π of order s is the generalized hexagon of order (s, 1) obtained from Π by putting  equal to the set of all flags of Π, by putting ℒ equal to the set of all points and lines of Π, and where I is the natural incidence relation (inverse containment), i.e., Γ is the dual of the double of Π in the sense of H. Van Maldeghem (1998, “Generalized Polygons,” Birkhäuser Verlag, Basel). Then we say that Γ is fully and weakly embedded in the finite projective space PG(dq) if Γ is a subgeometry of the natural point-line geometry associated with PG(dq), if s=q, if the set of points of Γ generates PG(dq), and if the set of points of Γ not opposite any given point of Γ does not generate PG(dq). In an earlier paper, we have shown that the dimension d of the projective space belongs to {6, 7, 8}, and that the projective plane Π is Desarguesian. Furthermore, we have given examples for d=6, 7. In the present paper we show that for d=6, only these examples exist, and we also partly handle the case d=7. More precisely, we completely classify the full and weak embeddings of Γ (Γ as above) in the case that there are two opposite lines L, M of Γ with the property that the subspace of PG(dq) generated by all lines of Γ meeting either L or M has dimension 6 (which is the case for all embeddings in PG(dq), d∈{6, 7}). Together with Parts 2 and 3, this will provide the complete classification of all full and weak embeddings of Γ. Copyright 2000 Academic Press.

Keywords: generalized hexagons; projective embeddings; projective planes

Document Type: Research Article

Affiliations: Department of Pure Mathematics and Computer Algebra, University of Ghent, Galglaan 2, Gent, B-9000, Belgium

Publication date: April 1, 2000

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