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'fragments/reports', 'Primitive Thisness and Primitive Identity' and 'On the General Idea of Proof Theory'
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4 ideas
5. Theory of Logic / B. Logical Consequence / 1. Logical Consequence
13827
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Logical consequence isn't a black box (Tarski's approach); we should explain how arguments work [Prawitz]
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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
6023
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Every proposition is either true or false [Chrysippus, by Cicero]
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5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models
13826
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Model theory looks at valid sentences and consequence, but not how we know these things [Prawitz]
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