Aristotle - The Organon - index for ANALYTICA PRIORIA Book 1 Part 18

One premiss assertoric, the other problematic

Paragraph 1 But if one premiss is assertoric, the other problematic, if the affirmative is assertoric and the negative problematic no syllogism will be possible, whether the premisses are universal or particular.
Paragraph 2 The same will hold good if the syllogisms are particular.

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