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Journal of Pure and Applied Algebra
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Journal of Pure and Applied Algebra
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Pseudocompact group topologies with no infinite compact subsets

Authors: Galindo, Jorge; Macario, Sergio;

Pseudocompact group topologies with no infinite compact subsets

Abstract

We show that every Abelian group satisfying a mild cardinal inequality admits a pseudocompact group topology from which all countable subgroups inherit the maximal totally bounded topology (we say that such a topology satisfies property $\h$). Every pseudocompact Abelian group $G$ with cardinality $|G|\leq 2^{2^\cc}$ satisfies this inequality and therefore admits a pseudocompact group topology with property $\h$. Under the Singular Cardinal Hypothesis (SCH) this criterion can be combined with an analysis of the algebraic structure of pseudocompact groups to prove that every pseudocompact Abelian group admits a pseudocompact group topology with property $\h$. We also observe that pseudocompact Abelian groups with property $\h$ contain no infinite compact subsets and are examples of Pontryagin reflexive precompact groups that are not compact.

19 pages; In this version we work assuming SCH (Singular Cardinal Hypothesis), whereas in our previous version we had to assume GCH (Generalized Continuum Hypothesis). The general problem is still open in ZFC, but models avoiding SCH are much harder to come by. We thank professors W. W. Comfort and D. Dikranjan for their help concerning Example 5.9.

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Spain
Related Organizations
Keywords

Pseudocompact group, Dominant rank, Group Theory (math.GR), Topology, #-property, 54H11, 20K99, G-dense, FOS: Mathematics, pseudocompact group, Mathematics - General Topology, Algebra and Number Theory, Abelian group, General Topology (math.GN), h-embedded, General properties and structure of LCA groups, Compact Abelian group, SCH, singular cardinal hypothesis, Analysis on general topological groups, Torsion-free rank, Pontryagin duality, Mathematics - Group Theory, Topological groups (topological aspects), Abelian groups

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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