Aristotle - The Organon - index for DE SOPHISTICIS ELENCHIS Section 3 Part 26

Comparing the conclusion with its contradictory

Paragraph 1 Refutations that depend on the definition of a refutation must, according to the plan sketched above, be met by comparing together the conclusion with its contradictory, and seeing that it shall involve the same attribute in the same respect and relation and manner and time.

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