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arXiv 1509.02446math.LO
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$Σ^0_3$ determinacy and ${\mathbfΠ}^1_2$ monotone induction

Sherwood Hachtman

英文摘要:

Building on recent work of Philip Welch, we prove that (lightface) $Σ^0_3$ determinacy is equivalent to the existence of a wellfounded model satisfying the axiom scheme of (boldface) $\mathbfΠ^1_2$ monotone induction.

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