Abstract
Let \({(N, \Phi)}\) be a finite circular Ferrero pair. We define the disk with center b and radius \({a, \mathcal{D}(a;b)}\), as
Using this definition we introduce the concept of interior part of a circle, \({\Phi(a)+b}\), as the set \({\mathcal{I}(\Phi (a)+b)=\mathcal{D} (a; b) \setminus (\Phi (a)+b)}\). Moreover, if \({\mathcal{B}^{\mathcal{D}}}\) is the set of all disks, then, in some interesting cases, we show that the incidence structure \({(N, \mathcal{B}^{\mathcal{D}}, \in)}\) is actually a balanced incomplete block design and we are able to calculate its parameters depending on |N| and \({|\Phi|}\).
Similar content being viewed by others
References
Anshel M., Clay J.R.: Planar algebraic systems, some geometric interpretations. J. Algebra 10, 166–173 (1968)
Anshel M., Clay J.R.: Planarity in algebraic systems. Bull. Am. Math. Soc. 74, 746–748 (1968)
Beidar K., Ke W., Kiechle H.: Circularity of finite groups without fixed points. Monatsh. Math. 144, 265–273 (2004)
Benini, A., Frigeri, A., Morini, F.: Codes and combinatorial structures from circular planar nearrings. Algebraic informatics, Lecture Notes in Computer Science, vol. 6742, pp. 115–126. Springer, Heidelberg (2011)
Clay J.R.: Generating balanced incomplete block designs from planar nearrings. J. Algebra 22, 319–331 (1972)
Clay J.R.: Geometric and combinatorial ideas related to circular planar nearrings. Bull. Inst. Math. Acad. Sin. 16, 275–283 (1988)
Clay J.R.: Nearrings: Geneses and Applications. Oxford University Press, Oxford (1991)
Clay J.R.: Geometry in fields. Algebra Colloq. 1(4), 289–306 (1994)
Eggetsberger, R.A.: Circles and their interior points from field generated Ferrero pairs. In: Nearrings, Nearfields and K-Loops, pp. 237–246. Kluwer, Dordrecht (1997)
Ferrero G.: Stems planari e bib-disegni. Riv. Mat. Univ. Parma 2(11), 79–96 (1970)
Fuchs P., Hofer G., Pilz G.: Codes from planar near-rings. IEEE Trans. Inf. Theory 36, 647–651 (1990)
Ke, W.: Structure of circular planar nearrings. PhD thesis, University of Arizona (1992)
Ke, W.: On recent developments of planar nearrings. In: Kiechle, H., Kreuzer, A., Thomsen, M.J. (eds.) Proceedings of the 18th International Conference on Nearrings and Nearfields Hamburg. Springer, Germany (2005)
Sun H.: Segments in a planar nearring. Discrete Math. 240(1–3), 205–217 (2001)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Benini, A., Frigeri, A. & Morini, F. BIB-Designs from Circular Nearrings. Results. Math. 64, 121–133 (2013). https://doi.org/10.1007/s00025-012-0303-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00025-012-0303-5