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Advances in Geometry

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Volume 13, Issue 1 (Jan 2013)


Blocking semiovals containing conics

J. M. Dover
  • Corresponding author
  • Dover Networks LLC, 445 Poplar Leaf Dr., Edgewater, MD 21037, USA
  • Email:
/ K. E. Mellinger
  • Corresponding author
  • Department of Mathematics, University of Mary Washington, 1301 College Avenue, Trinkle Hall, Fredericksburg, VA 22401-5300, USA
  • Email:
/ K. L. Wantz
  • Corresponding author
  • Department of Mathematics, Regent University, 1000 Regent University Dr., Virginia Beach, VA 23464, USA
  • Email:
Published Online: 2013-01-08 | DOI: https://doi.org/10.1515/advgeom-2012-0025


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.

About the article

Research supported by a sabbatical leave from the University of Mary Washington

Published Online: 2013-01-08

Published in Print: 2013-01-01

Citation Information: , ISSN (Online) 1615-7168, ISSN (Print) 1615-715X, DOI: https://doi.org/10.1515/advgeom-2012-0025. Export Citation

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