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2 ideas
5. Theory of Logic / B. Logical Consequence / 4. Semantic Consequence |=
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Formal semantics defines validity as truth preserved in every model [Williamson]
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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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