Combining Texts
Ideas for
'Three Varieties of Knowledge', 'On Interpretation' and 'Necessary Beings'
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5 ideas
5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic
19296
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If second-order variables range over sets, those are just objects; properties and relations aren't sets [Hale]
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5. Theory of Logic / C. Ontology of Logic / 4. Logic by Convention
19289
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Maybe conventionalism applies to meaning, but not to the truth of propositions expressed [Hale]
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5. Theory of Logic / D. Assumptions for Logic / 1. Bivalence
21593
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In talking of future sea-fights, Aristotle rejects bivalence [Aristotle, by Williamson]
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
1701
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A prayer is a sentence which is neither true nor false [Aristotle]
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5. Theory of Logic / H. Proof Systems / 4. Natural Deduction
19298
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Unlike axiom proofs, natural deduction proofs needn't focus on logical truths and theorems [Hale]
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