Article ID Journal Published Year Pages File Type
4660717 Topology and its Applications 2009 4 Pages PDF
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 H⊆ω12 that is an HFD with the following property(P)the projection of H onto every partial product I2 for I∈ω[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).

Related Topics
Physical Sciences and Engineering Mathematics Geometry and Topology