The finite subsets and the permutations with finitely many non‐fixed points of a set

Mathematical Logic Quarterly 67 (2):258-263 (2021)
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Abstract

We write and for the cardinalities of the set of finite subsets and the set of permutations with finitely many non‐fixed points, respectively, of a set which is of cardinality. In this paper, we investigate relationships between and for an infinite cardinal in the absence of the Axiom of Choice. We give conditions that make and comparable as well as give related consistency results.

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