Ideas from 'A Note on the entscheidungsproblem' by Alonzo Church [1936], by Theme Structure
[found in 'Journal of Symbolic Logic' (ed/tr -) [- ,]].
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5. Theory of Logic / K. Features of Logics / 7. Decidability
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18758
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Validity is provable, but invalidity isn't, because the model is infinite [McGee]
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