Aristotle - The Organon - index for ANALYTICA PRIORIA Book 2 Part 17

Proof by reductio

Paragraph 1 The objection that 'this is not the reason why the result is false', which we frequently make in argument, is made primarily in the case of a reductio ad impossibile, to rebut the proposition which was being proved by the reduction.
Paragraph 2 It is clear then that when the impossibility is not related to the original terms, the false conclusion does not result on account of the assumption.

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