Planar Functions and Planes of Lenz-Barlotti Class II

  • Authors:
  • Robert S. Coulter;Rex W. Matthews

  • Affiliations:
  • Department of Computer Science, The University of Queensland, St. Lucia, Queensland 4072, Australia/ shrub@cs.uq.edu.au;Department of Computer Science, The University of Queensland, St. Lucia, Queensland 4072, Australia/galois@hilbert.maths.utas.edu.au

  • Venue:
  • Designs, Codes and Cryptography
  • Year:
  • 1997

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Abstract

Planar functions were introduced by Dembowski and Ostrom [4] to describe projective planes possessinga collineation group with particular properties. Several classes of planar functions over a finite field are described,including a class whose associated affine planes are not translation planes or dual translation planes. This resolvesin the negative a question posed in [4]. These planar functions define at least one such affine plane of order 3 ^efor every e ≥ 4 and their projective closures are of Lenz-Barlotti type II. All previously known planes of type IIare obtained by derivation or lifting. At least when e is odd, the planes described here cannot be obtained in thismanner.