Abstract
An ordered graph is a graph together with a linear order on its vertices. A hereditary property of ordered graphs is a collection of ordered graphs closed under taking order-preserving isomorphisms of the vertex set, and order-preserving induced subgraphs. If P is a hereditary property of ordered graphs, then P n denotes the collection \( \left\{ {G \in \mathcal{P}:V(G) = [n]} \right\} \), and the function \( n \mapsto \left| {\mathcal{P}_n } \right| \) is called the speed of P.
The possible speeds of a hereditary property of labelled graphs have been extensively studied (see [BBW00] and [Bol98] for example), and more recently hereditary properties of other combinatorial structures, such as oriented graphs ([AS00], [BBM06+c]), posets ([BBM06+a], [BGP99]), words ([BB05], [QZ04]) and permutations ([KK03], [MT04]), have also attracted attention. Properties of ordered graphs generalize properties of both labelled graphs and permutations.
In this paper we determine the possible speeds of a hereditary property of ordered graphs, up to the speed 2n−1. In particular, we prove that there exists a jump from polynomial speed to speed F n, the Fibonacci numbers, and that there exists an infinite sequence of subsequent jumps, from p(n)F n,k to F n,k+1 (where p(n) is a polynomial and F n,k are the generalized Fibonacci numbers) converging to 2n−1. Our results generalize a theorem of Kaiser and Klazar [KK03], who proved that the same jumps occur for hereditary properties of permutations.
The first author was supported during this research by OTKA grant T049398 and NSF grant DMS-0302804, the second by NSF grant ITR 0225610, and the third by a Van Vleet Memorial Doctoral Fellowship.
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Balogh, J., Bollobás, B., Morris, R. (2006). Hereditary Properties of Ordered Graphs. In: Klazar, M., Kratochvíl, J., Loebl, M., Matoušek, J., Valtr, P., Thomas, R. (eds) Topics in Discrete Mathematics. Algorithms and Combinatorics, vol 26. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-33700-8_12
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