Combining Texts
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'fragments/reports', 'The Ages of the World' and 'A Note on the entscheidungsproblem'
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3 ideas
5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
8078
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Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
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Every proposition is either true or false [Chrysippus, by Cicero]
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5. Theory of Logic / K. Features of Logics / 7. Decidability
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Validity is provable, but invalidity isn't, because the model is infinite [Church, by McGee]
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