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'fragments/reports', 'Abstract Objects' and 'Mathematical Logic (revised)'
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4 ideas
5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
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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Every proposition is either true or false [Chrysippus, by Cicero]
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5. Theory of Logic / E. Structures of Logic / 4. Variables in Logic
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'Corner quotes' (quasi-quotation) designate 'whatever these terms designate' [Quine]
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5. Theory of Logic / F. Referring in Logic / 1. Naming / f. Names eliminated
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We might do without names, by converting them into predicates [Quine, by Kirkham]
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