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Ideas for 'fragments/reports', 'The Ethical Criticism of Art' and 'My Philosophical Development'

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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 / E. Structures of Logic / 1. Logical Form

7528	Leibniz bases everything on subject/predicate and substance/property propositions [Russell]

5. Theory of Logic / F. Referring in Logic / 1. Naming / e. Empty names

6439	Names are meaningless unless there is an object which they designate [Russell]