Geometric grid classes of permutations
Combinatorics
2012-02-06 v2
Abstract
A geometric grid class consists of those permutations that can be drawn on a specified set of line segments of slope \pm1 arranged in a rectangular pattern governed by a matrix. Using a mixture of geometric and language theoretic methods, we prove that such classes are specified by finite sets of forbidden permutations, are partially well ordered, and have rational generating functions. Furthermore, we show that these properties are inherited by the subclasses (under permutation involvement) of such classes, and establish the basic lattice theoretic properties of the collection of all such subclasses.
Cite
@article{arxiv.1108.6319,
title = {Geometric grid classes of permutations},
author = {Michael H. Albert and M. D. Atkinson and Mathilde Bouvel and Nik Ruškuc and Vincent Vatter},
journal= {arXiv preprint arXiv:1108.6319},
year = {2012}
}
Comments
Accepted to Trans. Amer. Math. Soc