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Self-duality in the class of precompact groups

机译:紧致群体中的自我对偶

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摘要

A topological Abelian group G is called (strongly) self-dual if there exists a topological isomorphism φ: G → G~∧ of G onto the dual group G~∧ (such that φ(x)(y) = φ(y)(x) for all x,y ∈ G). We prove that every countably compact self-dual Abelian group is finite. It turns out, however, that for every infinite cardinal κ with κ~ω =κ, there exists a pseudocompact, non-compact, strongly self-dual Boolean group of cardinality κ.
机译:如果在对偶群G〜∧上存在G的拓扑同构φ:G→G〜∧,则拓扑Abelian群G被(强烈)称为自对偶的(使得φ(x)(y)=φ(y) (x)对于所有x,y∈G)。我们证明,每个可数紧凑的自对偶阿贝尔群都是有限的。然而,事实证明,对于每个具有κ〜ω=κ的无限基数κ,都存在一个伪紧凑,非紧凑,强自对偶布尔基数κ基团。

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