Aristotle - The Organon - index for ANALYTICA PRIORIA Book 1 Part 26

What sort of problem is difficult to prove

Paragraph 1 Since we understand the subjects with which syllogisms are concerned, what sort of conclusion is established in each figure, and in how many moods this is done, it is evident to us both what sort of problem is difficult and what sort is easy to prove.
Paragraph 2 The manner in which every syllogism is produced, the number of the terms and premisses through which it proceeds, the relation of the premisses to one another, the character of the problem proved in each figure, and the number of the figures appropriate to each problem, all these matters are clear from what has been said.

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