Aristotle - The Organon - index for ANALYTICA POSTERIORA Book 2 Part 5

The method of division a not a process of inference

Paragraph 1 Nor, as was said in my formal logic, is the method of division a process of inference at all, since at no point does the characterization of the subject follow necessarily from the premising of certain other facts:
Paragraph 2 The champion of division might here urge that though these lapses do occur, yet we can solve that difficulty if all the attributes we assume are constituents of the definable form, and if, postulating the genus, we produce by division the requisite uninterrupted sequence of terms, and omit nothing;

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