Combining Texts

Ideas for 'fragments/reports', 'Inexpressible Properties and Propositions' and 'How to Make our Ideas Clear'

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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 / D. Assumptions for Logic / 2. Excluded Middle

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

5. Theory of Logic / G. Quantification / 4. Substitutional Quantification

17988

Quantification can't all be substitutional; some reference is obviously to objects [Hofweber]