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HFD groups in the Solovay model
Authors:Paul J. Szeptycki  Artur H. Tomita
Affiliation:a Department of Mathematics and Statistics, York University, Toronto, ON, Canada M3J 1P3
b Departamento de Matemática, Instituto de Matemática e Estatística, Universidade de São Paulo, Caixa Postal 66281, CEP 05315-970, São Paulo, Brazil
Abstract:
Hajnal and Juhász proved that under CH there is a hereditarily separable, hereditarily normal topological group without non-trivial convergent sequences that is countably compact and not Lindelöf. The example constructed is a topological subgroup Hω12 that is an HFD with the following property
(P)
the projection of H onto every partial product I2 for Iω[ω1] is onto.
Any such group has the necessary properties. We prove that if κ is a cardinal of uncountable cofinality, then in the model obtained by forcing over a model of CH with the measure algebra on κ2, there is an HFD topological group in ω12 which has property (P).
Keywords:primary, 54H11   secondary, 22A05, 54G20, 03E35
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