Combining Texts
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'fragments/reports', 'Theory of Science (Wissenschaftslehre, 4 vols)' and 'Monadology'
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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 / D. Assumptions for Logic / 3. Contradiction
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Falsehood involves a contradiction, and truth is contradictory of falsehood [Leibniz]
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