Aristotle - The Organon - index for DE SOPHISTICIS ELENCHIS Section 3 Part 25

Arguments depending on expressions not valid absolutely

Paragraph 1 Those arguments which depend upon an expression that is valid of a particular thing, or in a particular respect, or place, or manner, or relation, and not valid absolutely, should be solved by considering the conclusion in relation to its contradictory, to see if any of these things can possibly have happened to it.
Paragraph 2 All arguments of the following kind have this feature:

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