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Generalized permutation patterns - a short survey

Steingrimsson, Einar (2010) Generalized permutation patterns - a short survey. London Mathematical Society Lecture Note Series. 137–152.

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Abstract

An occurrence of a classical pattern p in a permutation π is a subsequence of π whose letters are in the same relative order (of size) as those in p. In an occurrence of a generalized pattern, some letters of that subsequence may be required to be adjacent in the permutation. Subsets of permutations characterized by the avoidance—or the prescribed number of occurrences— of generalized patterns exhibit connections to an enormous variety of other combinatorial structures, some of them apparently deep. We give a short overview of the state of the art for generalized patterns.