Combining Texts
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'fragments/reports', 'A Plea for Substitutional Quantification' and 'Lecture on Nominalism'
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5 ideas
5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
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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 / 6. Relations in Logic
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All relations, apart from ancestrals, can be reduced to simpler logic [Quine]
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5. Theory of Logic / G. Quantification / 4. Substitutional Quantification
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Substitutional existential quantifier may explain the existence of linguistic entities [Parsons,C]
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On the substitutional interpretation, '(∃x) Fx' is true iff a closed term 't' makes Ft true [Parsons,C]
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