The theory of subregular spreads of PG (3, q) was developed by R. H. Bruck (1969, in 00Combinatorial Mathematics and Its Applications,'' Chap. 27, pp. 426}514. Univ. of North Carolina Press, Chapel Hill). An extension of these results was provided to the higher-dimensional case by the author (1998,
Line spreads of PG(5, 2)
β Scribed by Zlatka T. Mateva; Svetlana T. Topalova
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 108 KB
- Volume
- 17
- Category
- Article
- ISSN
- 1063-8539
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
All line spreads of PG(5, 2) are constructed and classified up to equivalence by exhaustive generation considering the specific properties of the automorphism group, and the participation of the spread lines in the subspaces of dimension 3. There are 131,044 inequivalent spreads. The orders of the automorphism groups preserving the spreads, and the 2βranks of the related by Rahilly's construction affine 2β(64,16,5) designs are also computed. Β© 2008 Wiley Periodicals, Inc. J Combin Designs 17: 90β102, 2009
π SIMILAR VOLUMES
Starting out from the 15 pairs of opposite edges and the 20 faces of a coloured icosahedron , a simple new construction is given of a 'double-five' of planes in PG (5 , 2) . This last is a recently discovered configuration consisting of a set of (15 Ο© 20 Ο )35 points in PG (5 , 2) which admits five
Cameron and Liebler proposed the problem to determine the line sets of PG(d,q) having a fixed number of lines in common with each spread. In this paper we generalize this problem, characterizing the pairs (9, 3) of line sets such that 19 n gS?l = c for all g E PGL(d + 1, q). We shall do this more ge
A t-vY kY k design is a set of v points together with a collection of its k-subsets called blocks so that all subsets of t points are contained in exactly k blocks. The d-dimensional projective geometry over GFqY PGdY q, is a 2 Γ q d q dΓ1 Γ Γ Γ q 1Y q 1Y 1 design when we take its points as the poin