English

Generalized pentagonal geometries

Combinatorics 2021-04-20 v2

Abstract

A pentagonal geometry PENT(kk, rr) is a partial linear space, where every line is incident with kk points, every point is incident with rr lines, and for each point xx, there is a line incident with precisely those points that are not collinear with xx. Here we generalize the concept by allowing the points not collinear with xx to form the point set of a Steiner system S(2,k,w)S(2,k,w) whose blocks are lines of the geometry.

Keywords

Cite

@article{arxiv.2104.02760,
  title  = {Generalized pentagonal geometries},
  author = {Anthony D. Forbes and Carrie G. Rutherford},
  journal= {arXiv preprint arXiv:2104.02760},
  year   = {2021}
}

Comments

143 pages, 1 figure. An abridged version, with the Appendix omitted, will be submitted to a journal