Pseudocompact totally dense subgroups |
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Authors: | Dikran Dikranjan Anna Giordano Bruno |
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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 |
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Abstract: | It was shown by Dikranjan and Shakhmatov in 1992 that if a compact abelian group admits a proper totally dense pseudocompact subgroup, then cannot have a torsion closed -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 of that contains an -bounded dense subgroup of (such an is necessarily pseudocompact). This answers two questions posed by Dikranjan and Shakhmatov (Proc. Amer. Math. Soc. 114 (1992), 1119-1129). |
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