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Pseudocompact totally dense subgroups
Authors:Dikran Dikranjan  Anna Giordano Bruno
Institution:Dipartimento di Matematica e Informatica, Università di Udine, Via delle Scienze 206, 33100 Udine, Italy ; Dipartimento di Matematica e Informatica, Università di Udine, Via delle Scienze 206, 33100 Udine, Italy
Abstract:It was shown by Dikranjan and Shakhmatov in 1992 that if a compact abelian group $ K$ admits a proper totally dense pseudocompact subgroup, then $ K$ cannot have a torsion closed $ G_\delta$-subgroup; moreover this condition was shown to be also sufficient under LH. We prove in ZFC that this condition actually ensures the existence of a proper totally dense subgroup $ H$ of $ K$ that contains an $ \omega$-bounded dense subgroup of $ K$ (such an $ H$ is necessarily pseudocompact). This answers two questions posed by Dikranjan and Shakhmatov (Proc. Amer. Math. Soc. 114 (1992), 1119-1129).

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