Blocking sets of nonsecant lines to a conic in PG(2,q), q odd

In a previous paper 1, all point sets of minimum size in PG(2,q), blocking all external lines to a given irreducible conic ${\cal C}$, have been determined for every odd q. Here we obtain a similar classification for those point sets of minimum size, which meet every external and tangent line to ${\...

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Veröffentlicht in:Journal of combinatorial designs 2005-07, Vol.13 (4), p.292-301
Hauptverfasser: Aguglia, Angela, Korchmáros, Gábor
Format: Artikel
Sprache:eng
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Zusammenfassung:In a previous paper 1, all point sets of minimum size in PG(2,q), blocking all external lines to a given irreducible conic ${\cal C}$, have been determined for every odd q. Here we obtain a similar classification for those point sets of minimum size, which meet every external and tangent line to ${\cal C}$. © 2004 Wiley Periodicals, Inc.
ISSN:1063-8539
1520-6610
DOI:10.1002/jcd.20042