A new bound on the size of the largest critical set in a Latin square
Combinatorics
2007-05-23 v1
Abstract
A critical set in an n x n array is a set C of given entries, such that there exists a unique extension of C to an n x n Latin square and no proper subset of C has this property. The cardinality of the largest critical set in any Latin square of order n is denoted by lcs(n). In 1978 Curran and van Rees proved that lcs(n) <= n^2 - n. Here we show that lcs(n) <= n^2-3n+3.
Cite
@article{arxiv.math/0107159,
title = {A new bound on the size of the largest critical set in a Latin square},
author = {Richard Bean and E. S. Mahmoodian},
journal= {arXiv preprint arXiv:math/0107159},
year = {2007}
}
Comments
10 pages, LaTeX