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5 ideas
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
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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 / 1. Semantics of Logic
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In classical semantics singular terms refer, and quantifiers range over domains [Linnebo]
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5. Theory of Logic / K. Features of Logics / 1. Axiomatisation
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The axioms of group theory are not assertions, but a definition of a structure [Linnebo]
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To investigate axiomatic theories, mathematics needs its own foundational axioms [Linnebo]
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