Geodesic
Bohr compactifications of discrete structures
Fundamenta Mathematicae, Tome 160 (1999) no. 2, pp. 101-151.

Voir la notice de l'article provenant de la source Institute of Mathematics Polish Academy of Sciences

We prove the following theorem: Given a⊆ω and $1 ≤ α ω_1^{CK}$, if for some $η ℵ_1$ and all u ∈ WO of length η, a is $Σ _α^0(u)$, then a is $Σ_α^0$.} We use this result to give a new, forcing-free, proof of Leo Harrington's theorem: {$Σ_1^1 $-Turing-determinacy implies the existence of $0^{#}$}.
DOI : 10.4064/fm_1999_160_2_1_101_151

Joan E. Hart 1 ; Kenneth Kunen 1

1 
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Joan E. Hart; Kenneth Kunen. Bohr compactifications of discrete structures. Fundamenta Mathematicae, Tome 160 (1999) no. 2, pp. 101-151. doi : 10.4064/fm_1999_160_2_1_101_151. http://geodesic.mathdoc.fr/articles/10.4064/fm_1999_160_2_1_101_151/

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