We prove upper bounds for the spread, the Lindelöf number and the weak Lindelöf number of the Gδ-topology on a topological space and apply a few of our bounds to give a short proof to a recent result of Juhász and van Mill regarding the cardinality of a σ-countably tight homogeneous compactum.
Cardinal invariants for the Gδ delta topology
A. Bella;S. Spadaro
2019
Abstract
We prove upper bounds for the spread, the Lindelöf number and the weak Lindelöf number of the Gδ-topology on a topological space and apply a few of our bounds to give a short proof to a recent result of Juhász and van Mill regarding the cardinality of a σ-countably tight homogeneous compactum.File in questo prodotto:
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