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'fragments/reports', 'Transworld Heir Lines' and 'The Laws of Thought'
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5 ideas
5. Theory of Logic / A. Overview of Logic / 2. History of Logic
8686
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Boole made logic more mathematical, with algebra, quantifiers and probability [Boole, by Friend]
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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 / C. Ontology of Logic / 1. Ontology of Logic
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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 / H. Proof Systems / 2. Axiomatic Proof
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Boole's method was axiomatic, achieving economy, plus multiple interpretations [Boole, by Potter]
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