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5 ideas

5. Theory of Logic / A. Overview of Logic / 3. Value of Logic

16728

Logicians acknowledge too few things, while others acknowledge too many [Fitzralph]

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

21668

Epicurus rejected excluded middle, because accepting it for events is fatalistic [Epicurus, by Cicero]

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

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / e. or

21676

Epicureans say disjunctions can be true whiile the disjuncts are not true [Epicurus, by Cicero]