Combining Texts

Ideas for 'fragments/reports', 'Vagueness, Truth and Logic' and 'Proof that every set can be well-ordered'

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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]

9775	Excluded Middle, and classical logic, may fail for vague predicates [Fine,K]

5. Theory of Logic / I. Semantics of Logic / 3. Logical Truth

9771	Logic holding between indefinite sentences is the core of all language [Fine,K]