Abstract
For a fixed hyperbolic quadric 𝓗 in PG(3, q), let 𝔼 (respectively 𝕋, 𝕊) denote the set of all lines of PG(3, q) which are external (respectively tangent, secant) with respect to 𝓗. We characterize the minimum size blocking sets of PG(3, q) with respect to each of the line sets 𝕊, 𝕋 ∪ 𝕊 and 𝔼 ∪ 𝕊.
Communicated by: G. Korchmáros
Funding: The first author was partially supported by SERB Project No. MTR/2017/000372, Department of Science and Technology, Government of India.
References
[1] A. Aguglia, M. Giulietti, Blocking sets of certain line sets related to a conic. Des. Codes Cryptogr. 39 (2006), 397–405. MR2216279 Zbl 1172.5130510.1007/s10623-005-6131-9Search in Google Scholar
[2] A. Aguglia, G. Korchmáros, Blocking sets of nonsecant lines to a conic in PG(2, q), q odd. J. Combin. Des. 13 (2005), 292–301. MR2143981 Zbl 1078.5100710.1002/jcd.20042Search in Google Scholar
[3] A. Aguglia, G. Korchmáros, Blocking sets of external lines to a conic in PG(2, q), q odd. Combinatorica26 (2006), 379–394. MR2260844 Zbl 1111.5100710.1007/s00493-006-0021-2Search in Google Scholar
[4] A. Aguglia, G. Korchmáros, A. Siciliano, Minimal covering of all chords of a conic in PG(2, q), q even. Bull. Belg. Math. Soc. Simon Stevin12 (2005), 651–655. MR2241331 Zbl 1142.5100610.36045/bbms/1136902603Search in Google Scholar
[5] P. Biondi, P. M. Lo Re, On blocking sets of external lines to a hyperbolic quadric in PG(3, q), q even. J. Geom. 92 (2009), 23–27. Zbl 1170.5100410.1007/s00022-008-1962-ySearch in Google Scholar
[6] P. Biondi, P. M. Lo Re, L. Storme, On minimum size blocking sets of external lines to a quadric in PG(3, q). Beiträge Algebra Geom. 48 (2007), 209–215. MR2326410 Zbl 1121.5100610.2140/iig.2007.5.1Search in Google Scholar
[7] E. Boros, Z. Füredi, J. Kahn, Maximal intersecting families and affine regular polygons in PG(2, q). J. Combin. Theory Ser. A52 (1989), 1–9. MR1008155 Zbl 0737.0500310.1016/0097-3165(89)90057-5Search in Google Scholar
[8] R. C. Bose, R. C. Burton, A characterization of flat spaces in a finite geometry and the uniqueness of the Hamming and the MacDonald codes. J. Combin. Theory Ser. A1 (1966), 96–104. MR0197215 Zbl 0152.1810610.1016/S0021-9800(66)80007-8Search in Google Scholar
[9] P. Erdős, L. Lovász, Problems and results on 3-chromatic hypergraphs and some related questions. North-Holland 1975. MR0382050 Zbl 0315.05117Search in Google Scholar
[10] J. W. P. Hirschfeld, Finite projective spaces of three dimensions. Oxford Univ. Press 1985. MR840877 Zbl 0574.51001Search in Google Scholar
[11] F. Mazzocca, Blocking sets with respect to special families of lines and nuclei of θn-sets in finite n-dimensional projective and affine spaces. In: Proceedings of the First International Conference on Blocking Sets (Giessen, 1989), Mitt. Math. Semin. Giessen201 (1991), 109–117. MR1126310 Zbl 0741.51014Search in Google Scholar
[12] G. E. Moorhouse, Incidence Geometry. Course notes 2017, available at http://ericmoorhouse.org/handouts/Incidence_Geometry.pdfSearch in Google Scholar
[13] K. L. Patra, B. K. Sahoo, B. Sahu, Minimum size blocking sets of certain line sets related to a conic in PG(2, q). Discrete Math. 339 (2016), 1716–1721. MR3477101 Zbl 1338.5100910.1016/j.disc.2016.01.010Search in Google Scholar
[14] S. E. Payne, J. A. Thas, Finite generalized quadrangles. European Mathematical Society, Zürich 2009. MR2508121 Zbl 1247.0504710.4171/066Search in Google Scholar
[15] B. K. Sahoo, B. Sahu, Blocking sets of tangent and external lines to a hyperbolic quadric in PG(3, q), q even. Proc. Indian Acad. Sci. Math. Sci., to appear.Search in Google Scholar
[16] B. K. Sahoo, N. S. N. Sastry, Binary codes of the sympletic generalized quadrangle of even order. Des. Codes Cryptogr. 79 (2016), 163–170.10.1007/s10623-015-0040-3Search in Google Scholar
[17] Z. Weiner, T. Szőnyi, On the stability of sets of even type. Adv. Math. 267 (2014), 381–394. MR3269183 Zbl 1337.5100310.1016/j.aim.2014.09.007Search in Google Scholar
© 2019 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- A Batyrev type classification of ℚ-factorial projective toric varieties
- Blocking sets of certain line sets related to a hyperbolic quadric in PG(3, q)
- Affine-compact functors
- Limit points of the branch locus of 𝓜g
- Criteria for strict monotonicity of the mixed volume of convex polytopes
- Principal curvatures and parallel surfaces of wave fronts
- Nodal curves with a contact-conic and Zariski pairs
- Corrigendum to the paper “On surfaces with two apparent double points”
Articles in the same Issue
- Frontmatter
- A Batyrev type classification of ℚ-factorial projective toric varieties
- Blocking sets of certain line sets related to a hyperbolic quadric in PG(3, q)
- Affine-compact functors
- Limit points of the branch locus of 𝓜g
- Criteria for strict monotonicity of the mixed volume of convex polytopes
- Principal curvatures and parallel surfaces of wave fronts
- Nodal curves with a contact-conic and Zariski pairs
- Corrigendum to the paper “On surfaces with two apparent double points”