Geodesic
The prevalence of permutations with infinite cycles
Fundamenta Mathematicae, Tome 144 (1994) no. 1, pp. 89-94.

Voir la notice de l'article provenant de la source Institute of Mathematics Polish Academy of Sciences

A number of recent papers have been devoted to the study of prevalence, a generalization of the property of being of full Haar measure to topological groups which need not have a Haar measure, and the dual concept of shyness. These concepts give a notion of "largeness" which often differs from the category analogue, comeagerness, and may be closer to the intuitive notion of "almost everywhere." In this paper, we consider the group of permutations of natural numbers. Here, in the sense of category, "almost all" permutations have only finite cycles. In contrast, we show that, in terms of prevalence, "almost all" permutations have infinitely many infinite cycles and only finitely many finite cycles; this set of permutations comprises countably many conjugacy classes, each of which is non-shy.
DOI : 10.4064/fm_1994_144_1_1_89_94

Randall Dougherty 1 ; Jan Mycielski 1

1 
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Randall Dougherty; Jan Mycielski. The prevalence of permutations with infinite cycles. Fundamenta Mathematicae, Tome 144 (1994) no. 1, pp. 89-94. doi : 10.4064/fm_1994_144_1_1_89_94. http://geodesic.mathdoc.fr/articles/10.4064/fm_1994_144_1_1_89_94/

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