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Ideas for 'fragments/reports', 'The Justification of Deduction' and 'Demonstratives'

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2 ideas

5. Theory of Logic / B. Logical Consequence / 2. Types of Consequence

19058

Syntactic consequence is positive, for validity; semantic version is negative, with counterexamples [Dummett]

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]