Combining Texts
Ideas for
'fragments/reports', 'works' and 'The Idea of the Brain'
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5 ideas
5. Theory of Logic / A. Overview of Logic / 4. Pure Logic
10048
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There is no clear boundary between the logical and the non-logical [Tarski]
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5. Theory of Logic / B. Logical Consequence / 4. Semantic Consequence |=
10694
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Logical consequence is when in any model in which the premises are true, the conclusion is true [Tarski, by Beall/Restall]
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10479
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Logical consequence: true premises give true conclusions under all interpretations [Tarski, by Hodges,W]
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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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