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'fragments/reports', 'The Rise of Analytic Philosophy 1879-1930' and 'The Facts of Causation'
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5 ideas
5. Theory of Logic / B. Logical Consequence / 3. Deductive Consequence |-
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Frege's sign |--- meant judgements, but the modern |- turnstile means inference, with intecedents [Potter]
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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 / 3. If-Thenism
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Deductivism can't explain how the world supports unconditional conclusions [Potter]
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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 / 3. Logical Truth
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Modern logical truths are true under all interpretations of the non-logical words [Potter]
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