Cardinal invariants distinguishing permutation groups

preprint2015arXivOpen access

Abstract

We prove that for infinite cardinals κ<λκ<λ the alternating group Alt(λ)Alt(λ) (of even permutations) of λλ is not embeddable into the symmetric group Sym(κ)Sym(κ) (of all permutations) of κκ. To prove this fact we introduce and study several monotone cardinal group invariants which take value κκ on the groups Alt(κ)Alt(κ) and Sym(κ)Sym(κ).

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