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Ideas for 'fragments/reports', 'Science of Logic' and 'Reasoning and the Logic of Things'

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2 ideas

5. Theory of Logic / B. Logical Consequence / 4. Semantic Consequence |=

19237

Deduction is true when the premises facts necessarily make the conclusion fact true [Peirce]

5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens

8078	Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]