Combining Texts

Ideas for 'fragments/reports', 'Parts of Classes' and 'The Structure of Science'

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4 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 / 6. Plural Quantification

15525

Plural quantification lacks a complete axiom system [Lewis]

15518

I like plural quantification, but am not convinced of its connection with second-order logic [Lewis]