Aristotle - The Organon - index for ANALYTICA PRIORIA Book 2 Part 7

... in the third figure

Paragraph 1 In the third figure, when both premisses are taken universally, it is not possible to prove them reciprocally:
Paragraph 2 It is clear then that in the first figure reciprocal proof is made both through the third and through the first figure - if the conclusion is affirmative through the first;

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