Inflations of geometric grid classes of permutations
Inflations of geometric grid classes of permutations
复制标题
排列的几何网格类的膨胀
DOI:
10.1007/s11856-014-1098-8
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发表时间:
2014
影响因子:
1
通讯作者:
Albert M
中科院分区:
文献类型:
--
作者:
Albert M
Geometric grid classes and the substitution decomposition have both been shown to be fundamental in the understanding of the structure of permutation classes. In particular, these are the two main tools in the recent classification of permutation classes of growth rate less thanκ≈ 2.20557 (a specific algebraic integer at which infinite antichains first appear). Using language- and order-theoretic methods, we prove that the substitution closures of geometric grid classes are well partially ordered, finitely based, and that all their subclasses have algebraic generating functions. We go on to show that the inflation of a geometric grid class by a strongly rational class is well partially ordered, and that all its subclasses have rational generating functions. This latter fact allows us to conclude that every permutation class with growth rate less thanκhas a rational generating function. This bound is tight as there are permutation classes with growth rateκwhich have nonrational generating functions.
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影响因子:
0.7
作者:
Sophie Huczynska;Vincent Vatter
通讯作者:
Vincent Vatter
影响因子:
1.1
作者:
M. Albert;M. Atkinson;N. Ruškuc
通讯作者:
N. Ruškuc
影响因子:
0.8
作者:
Albert, MH;Atkinson, MD
通讯作者:
Atkinson, MD
影响因子:
0.8
作者:
Vincent Vatter
通讯作者:
Vincent Vatter
DOI:
10.1017/s0963548309009699
发表时间:
2009
期刊:
Combinatorics, Probability and Computing
影响因子:
--
作者:
M. Albert;S. Linton
通讯作者:
S. Linton