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'fragments/reports', 'Logical Consequence' and 'Phenomenal and Perceptual Concepts'
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8 ideas
5. Theory of Logic / B. Logical Consequence / 1. Logical Consequence
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18755
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Validity is explained as truth in all models, because that relies on the logical terms [McGee]
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5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
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8078
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Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
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6023
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Every proposition is either true or false [Chrysippus, by Cicero]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
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18751
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Natural language includes connectives like 'because' which are not truth-functional [McGee]
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5. Theory of Logic / G. Quantification / 5. Second-Order Quantification
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18761
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Second-order variables need to range over more than collections of first-order objects [McGee]
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5. Theory of Logic / I. Semantics of Logic / 1. Semantics of Logic
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18753
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An ontologically secure semantics for predicate calculus relies on sets [McGee]
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5. Theory of Logic / I. Semantics of Logic / 3. Logical Truth
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18754
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Logically valid sentences are analytic truths which are just true because of their logical words [McGee]
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5. Theory of Logic / K. Features of Logics / 3. Soundness
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18757
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Soundness theorems are uninformative, because they rely on soundness in their proofs [McGee]
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