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On automatic infinite permutations∗

Published online by Cambridge University Press:  23 November 2011

Anna Frid
Affiliation:
Sobolev Institute of Mathematics SB RAS, Koptyug av. 4, 630090 Novosibirsk, Russia.. anna.e.frid@gmail.com Institut Camille Jordan, Université Lyon 1, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne Cedex, France.; zamboni@math.univ-lyon1.fr.
Luca Zamboni
Affiliation:
Institut Camille Jordan, Université Lyon 1, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne Cedex, France.; zamboni@math.univ-lyon1.fr. Department of Mathematics and Turku Centre for Computer Science, University of Turku, 20014 Turku, Finland.

Abstract

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An infinite permutation α is a linear ordering of N. We study propertiesof infinite permutations analogous to those of infinite words, and show some resemblancesand some differences between permutations and words. In this paper, we try to extend topermutations the notion of automaticity. As we shall show, the standard definitions whichare equivalent in the case of words are not equivalent in the context of permutations. Weinvestigate the relationships between these definitions and prove that they constitute achain of inclusions. We also construct and study an automaton generating the Thue-Morsepermutation.