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'fragments/reports', 'Letter to Mersenne' and 'Mathematical Methods in Philosophy'
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5 ideas
5. Theory of Logic / A. Overview of Logic / 9. Philosophical Logic
18739
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Three stages of philosophical logic: syntactic (1905-55), possible worlds (1963-85), widening (1990-) [Horsten/Pettigrew]
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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 / 1. Logical Form
18741
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Logical formalization makes concepts precise, and also shows their interrelation [Horsten/Pettigrew]
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5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models
18744
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Models are sets with functions and relations, and truth built up from the components [Horsten/Pettigrew]
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