
Let \(\sigma \in S_n\) be a permutation and let \([\sigma]\) be the class of all cyclic permutations of \(\sigma\). For \(\pi \in S_n\), \(\pi =(b_1,b_2,...,b_n)\), denote by \(\pi^R\) the permutation \((b_n,...,b_1)\in S_n\). Also denote by \(\) the set \([\sigma]\cup \{\tau^R;\quad \tau \in [\sigma]\}.\) In this paper the authors study the function \(F(n)=\max \min I(\sigma)\), where \(I(\sigma)\) is the number of inversions in \(\sigma\), the max is over \(\pi \in S_n\) and the min over \(\sigma\in[\pi].\) The main result is the following theorem: \[ 0.304^-n^2+0(n)=\frac{8-\pi}{16}\cdot n^2-\frac{3n}{2}\leq F(n)\leq \frac{n^2}{3}-\frac{3n-1}{6}=0.333^+n^2+0(n). \] The measures of complexity considered are the number of inversions and the diameter of the permutation.
Permutations, words, matrices, permutations, inversions, Discrete Mathematics and Combinatorics, Theoretical Computer Science
Permutations, words, matrices, permutations, inversions, Discrete Mathematics and Combinatorics, Theoretical Computer Science
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