2021/05/06 by Dudek, Andrzej, Grytczuk, Jarosław, Ruciński, Andrzej · 1 citation
#Combinatorics (math.CO) #FOS: Mathematics
paper · doi:10.48550/arxiv.2105.02591
Two permutations are similar if they have the same length and the same relative order. A collection of r≥2 disjoint, similar subsequences of a permutation π form r-twins in π. We study the longest guaranteed length of r-twins which are tight in the sense that either each twin alone forms a block or their union does. We address the same question with respect to a random permutation.