A pattern theorem for random sorting networks

Omer Angel; Vadim Gorin; Alexander E. Holroyd

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arXiv · 1110.0160

A pattern theorem for random sorting networks

Omer Angel·Vadim Gorin·Alexander E. Holroyd

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Abstract

A sorting network is a shortest path from 12..n to n..21 in the Cayley graph of the symmetric group S(n) generated by nearest-neighbor swaps. A pattern is a sequence of swaps that forms an initial segment of some sorting network. We prove that in a uniformly random n-element sorting network, any fixed pattern occurs in at least cn^2 disjoint space-time locations, with probability tending to 1 exponentially fast as n tends to infinity. Here c is a positive constant which depends on the choice of pattern. As a consequence, the probability that the uniformly random sorting network is geometrically realizable tends to 0.

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Omer Angel, Vadim Gorin, Alexander E. Holroyd. 2012-11-20. A pattern theorem for random sorting networks. https://arxiv.org/abs/1110.0160

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