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A set mapping with no infinite free subsets
Published online by Cambridge University Press: 12 March 2014
Abstract
It is consistent that there exists a set mapping F: [ω2]2 → [ω2]<ω such that F(α,β) ⊆ α for α < β < ω2 and there is no infinite free subset for F. This solves a problem of A. Hajnal and A. Máté.
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- Research Article
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- Copyright © Association for Symbolic Logic 1991
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