English

Transitive $(q-1)$-fold packings of $\rm{PG}_n(q)$

Combinatorics 2024-02-02 v1

Abstract

A tt-fold packing of a projective space PGn(q)\rm{PG}_n(q) is a collection P\mathcal{P} of line-spreads such that each line of PGn(q)\rm{PG}_n(q) occurs in precisely tt spreads in P\mathcal{P}. A tt-fold packing P\mathcal{P} is transitive if a subgroup of PΓLn+1(q)\rm{P\Gamma L}_{n+1}(q) preserves and acts transitively on P\mathcal{P}. We give a construction for a transitive (q1)(q-1)-fold packing of PGn(q)\rm{PG}_n(q), where q=2kq=2^k, for any odd positive integers nn and kk, such that n3n\geq 3. This generalises a construction of Baker from 1976 for the case q=2q=2.

Keywords

Cite

@article{arxiv.2402.00780,
  title  = {Transitive $(q-1)$-fold packings of $\rm{PG}_n(q)$},
  author = {Daniel R. Hawtin},
  journal= {arXiv preprint arXiv:2402.00780},
  year   = {2024}
}

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5 pages