Advances in Geometry
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Blocking semiovals containing conics
1Dover Networks LLC, 445 Poplar Leaf Dr., Edgewater, MD 21037, USA
2Department of Mathematics, University of Mary Washington, 1301 College Avenue, Trinkle Hall, Fredericksburg, VA 22401-5300, USA
3Department of Mathematics, Regent University, 1000 Regent University Dr., Virginia Beach, VA 23464, USA
Citation Information: . Volume 13, Issue 1, Pages 29–40, ISSN (Online) 1615-7168, ISSN (Print) 1615-715X, DOI: https://doi.org/10.1515/advgeom-2012-0025, January 2013
- Published Online:
A blocking semioval is a set of points in a projective plane that is both a blocking set (i.e., every line meets the set, but the set contains no line) and a semioval (i.e., there is a unique tangent line at each point). Sz˝onyi investigated an infinite family of blocking semiovals that are formed from the union of conics contained in a particular type of algebraic pencil. In this paper, the authors look at the general problem of blocking semiovals containing conics, proving a lower bound on the size of such sets and providing several new constructions of blocking semiovals containing conics. In addition, the authors investigate the natural generalization of Sz˝onyi’s construction to other conic pencils.
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