Combining Texts
Ideas for
'fragments/reports', 'The Justification of Deduction' and 'Letters to Leibniz 1'
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2 ideas
5. Theory of Logic / B. Logical Consequence / 2. Types of Consequence
19058
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Syntactic consequence is positive, for validity; semantic version is negative, with counterexamples [Dummett]
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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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