Abstract
An important problem in the theory of permutation codes is finding the value of $P(n,d)$ , the size of the largest subset of the set of all permutations $S_{n}$ with minimum Kendall $\tau $ -distance $d$ . Using an integer programming approach, we find the values of $P(5,d)$ for $d \geq 3$ and $P(6,d)$ for $d \geq 4$ . We give instances of codes which achieve these values. We also show that $P(6,3) \geq 102$ by giving a code of cardinality 102 in $S_{6}$ , which has minimum Kendall $\tau $ -distance 3.
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