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Pseudocompact totally dense subgroups
Author(s):
Dikran
Dikranjan;
Anna
Giordano
Bruno
Journal:
Proc. Amer. Math. Soc.
136
(2008),
1093-1103.
MSC (2000):
Primary 22A05, 54H11;
Secondary 22C05, 54D25.
Posted:
November 30, 2007
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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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Additional Information:
Dikran
Dikranjan
Affiliation:
Dipartimento di Matematica e Informatica, Università di Udine, Via delle Scienze 206, 33100 Udine, Italy
Email:
dikranja@dimi.uniud.it
Anna
Giordano
Bruno
Affiliation:
Dipartimento di Matematica e Informatica, Università di Udine, Via delle Scienze 206, 33100 Udine, Italy
Email:
giordano@dimi.uniud.it
DOI:
10.1090/S0002-9939-07-09099-5
PII:
S 0002-9939(07)09099-5
Received by editor(s):
May 8, 2006
Received by editor(s) in revised form:
October 23, 2006
Posted:
November 30, 2007
Additional Notes:
This work was partially supported by a PRIN2005 grant of the Italian MIUR and by funds of the PhD program at the Department of Mathematics of the University of Udine.
Communicated by:
Alexander N. Dranishnikov
Copyright of article:
Copyright
2007,
American Mathematical Society
The copyright for this article reverts to public domain after 28 years from publication.
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