[Unfinished] Wiggy: Friend or Foe?

If the truth of one proposition follows from the truth of others, this expresses itself in relations in which the forms of these propositions stand to one another, and we do not need to put them in these relations first by connecting them with one another in a proposition; for these relations are internal, and exist as soon as, and by the very fact that, the propositions exist. (5.131)

If p follows from q, I can conclude from q to p; infer p from q. The method of inference is to be understood from the two propositions alone. Only they themselves can justify the inference. Laws of inference, which — as in Frege and Russel — are to justify the conclusions, are senseless and would be superfluous. (5.132)

All inference takes place a priori. (5.133)

Notes

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