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'fragments/reports', 'Transworld Heir Lines' and 'Reason, Truth and History'
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5 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 / C. Ontology of Logic / 1. Ontology of Logic
11970
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Logicians like their entities to exhibit a maximum degree of purity [Kaplan]
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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 / I. Semantics of Logic / 6. Intensionalism
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Intension is not meaning, as 'cube' and 'square-faced polyhedron' are intensionally the same [Putnam]
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5. Theory of Logic / J. Model Theory in Logic / 2. Isomorphisms
14207
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If cats equal cherries, model theory allows reinterpretation of the whole language preserving truth [Putnam]
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