Critical sets in the elementary abelian 2 and 3 groups
Abstract
In 1998, Khodkar showed that the minimal critical set in the Latin square corresponding to the elementary abelian 2group of order 16 is of size at most 124. Since the paper was published, improved methods for solving integer programming problems have been developed. Here we give an example of a critical set of size 121 in this Latin square, found through such methods. We also give a new upper bound on the size of critical sets of minimal size for the elementary abelian 2group of order $2^n$: $4^{n}3^{n}+42^{n}2^{n2}$. We speculate about possible lower bounds for this value, given some other results for the elementary abelian 2groups of orders 32 and 64. An example of a critical set of size 29 in the Latin square corresponding to the elementary abelian 3group of order 9 is given, and it is shown that any such critical set must be of size at least 24, improving the bound of 21 given by Donovan, Cooper, Nott and Seberry.
 Publication:

arXiv Mathematics eprints
 Pub Date:
 February 2004
 arXiv:
 arXiv:math/0403006
 Bibcode:
 2004math......3006B
 Keywords:

 Mathematics  Combinatorics;
 05B15
 EPrint:
 9 pages