Combining Philosophers

Ideas for Chrysippus, John Locke and Ferdinand Tnnies

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3 ideas

5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens

8078	Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]

5. Theory of Logic / C. Ontology of Logic / 3. If-Thenism

10055

Mathematical proofs work, irrespective of whether the objects exist [Locke]

5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle

6023	Every proposition is either true or false [Chrysippus, by Cicero]