A projective plane is an outstanding 2-cover

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1 Citation (Scopus)


C(υ, k, 2) denotes the minimum number of k-subsets required to cover all pairs of a υ-set. Obviously, C(n2+ n + 1, n + 1, 2) ≥n2+ n + 1 where equality holds if and only if a finite projective plane exists. In this note the following conjecture of Mendelsohn is proved. If a PG(2, n) does not exist, then C(n2+ n + 1)≥n2+ n + 3.

Original languageEnglish
Pages (from-to)321-324
Number of pages4
JournalDiscrete Mathematics
Issue number3
Publication statusPublished - 1989

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Discrete Mathematics and Combinatorics

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