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'fragments/reports', 'Philosophical Logic: Intro to Advanced Topics' and 'works'
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6 ideas
5. Theory of Logic / A. Overview of Logic / 4. Pure Logic
13850
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In modern logic all formal validity can be characterised syntactically [Engelbretsen/Sayward]
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5. Theory of Logic / A. Overview of Logic / 6. Classical Logic
13849
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Classical logic rests on truth and models, where constructivist logic rests on defence and refutation [Engelbretsen/Sayward]
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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 / 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 / D. Assumptions for Logic / 4. Identity in Logic
13851
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Unlike most other signs, = cannot be eliminated [Engelbretsen/Sayward]
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5. Theory of Logic / K. Features of Logics / 5. Incompleteness
13852
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Axioms are ω-incomplete if the instances are all derivable, but the universal quantification isn't [Engelbretsen/Sayward]
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