Combining Texts
Ideas for
'fragments/reports', 'The Logical Syntax of Language' and 'On Propositions: What they are, and Meaning'
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4 ideas
5. Theory of Logic / B. Logical Consequence / 1. Logical Consequence
13342
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Carnap defined consequence by contradiction, but this is unintuitive and changes with substitution [Tarski on Carnap]
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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 / 4. Logic by Convention
13251
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Each person is free to build their own logic, just by specifying a syntax [Carnap]
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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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