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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 / 5. Second-Order Quantification

10569

If you ask what F the second-order quantifier quantifies over, you treat it as first-order [Fine,K]

5. Theory of Logic / I. Semantics of Logic / 1. Semantics of Logic

10570

Assigning an entity to each predicate in semantics is largely a technical convenience [Fine,K]