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Densities in large permutations and parameter testing. (English) Zbl 1348.05010
Summary: A classical theorem of P. Erdős et al. [Graph theory and related topics, Proc. Conf. Honour W. T. Tutte, Waterloo/Ont. 1977, 165–172 (1979; Zbl 0462.05057)] asserts that the densities of connected subgraphs in large graphs are independent. We prove an analogue of this theorem for permutations and we then apply the methods used in the proof to give an example of a finitely approximable permutation parameter that is not finitely forcible. The latter answers a question posed by two of the authors and C. Hoppen et al. [in: Proceedings of the 21st annual ACM-SIAM symposium on discrete algorithms, SODA 2010, Austin, TX, USA, January 17–19, 2010. Philadelphia, PA: Society for Industrial and Applied Mathematics (SIAM); New York, NY: Association for Computing Machinery (ACM). 66–75 (2010; Zbl 1288.68187)].

##### MSC:
 05A05 Permutations, words, matrices 05C42 Density (toughness, etc.) 05C40 Connectivity
##### Keywords:
graphcopy functions
Full Text:
##### References:
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