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'On the Question of Absolute Undecidability', 'A Note on the entscheidungsproblem' and '01: Book of Genesis'
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5. Theory of Logic / K. Features of Logics / 5. Incompleteness
17894
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We have no argument to show a statement is absolutely undecidable [Koellner]
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5. Theory of Logic / K. Features of Logics / 7. Decidability
18758
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Validity is provable, but invalidity isn't, because the model is infinite [Church, by McGee]
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