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Ideas for 'fragments/reports', 'W.V. Quine' and 'German Philosophy 1760-1860'

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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 / 1. Quantification

8452	Traditionally, universal sentences had existential import, but were later treated as conditional claims [Orenstein]

5. Theory of Logic / G. Quantification / 4. Substitutional Quantification

8475	The substitution view of quantification says a sentence is true when there is a substitution instance [Orenstein]