Labelled well-quasi-order for permutation classes

Brignall, Robert and Vatter, Vincent (2022). Labelled well-quasi-order for permutation classes. Combinatorial Theory, 2(3)

Abstract

While the theory of labelled well-quasi-order has received significant attention in the graph setting, it has not yet been considered in the context of permutation patterns. We initiate this study here, and show how labelled well quasi order provides a lens through which to view and extend previous well-quasi-order results in the permutation patterns literature. Connections to the graph setting are emphasised throughout. In particular, we establish that a permutation class is labelled well-quasi-ordered if and only if its corresponding graph class is also labelled well-quasi-ordered.

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