Combining Texts

Ideas for 'On the Question of Absolute Undecidability', 'Tractatus Logico-Philosophicus' and 'Reasoning and the Logic of Things'

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2 ideas

5. Theory of Logic / B. Logical Consequence / 3. Deductive Consequence |-

18277

If q implies p, that is justified by q and p, not by some 'laws' of inference [Wittgenstein]

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]