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18277 | If q implies p, that is justified by q and p, not by some 'laws' of inference [Wittgenstein] |
Full Idea: If p follows from q, I can make an inference from q to p, deduce p from q. The nature of the inference can be gathered only from the two propositions. They are the only possible justification of the inference. 'Laws of Inference' would be superfluous. | |
From: Ludwig Wittgenstein (Tractatus Logico-Philosophicus [1921], 5.132) | |
A reaction: That seems to imply that each inference is judged on its particulars. But logic aims to be general. There seem to be 'laws' at a more complex level in the logic. |