Aristotle - The Organon DE SOPHISTICIS ELENCHIS Section 3 Part 29

Refutations whose reasoning depends on some addition

1. In the case of any refutations whose reasoning depends on some addition, look and see if upon its subtraction the absurdity follows none the less: and then if so, the answerer should point this out, and say that he granted the addition not because he really thought it, but for the sake of the argument, whereas the questioner has not used it for the purpose of his argument at all.

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