Aristotle - The Organon - index for ANALYTICA PRIORIA Book 1 Part 13

Proof of or from possibility

Paragraph 1 Perhaps enough has been said about the proof of necessity, how it comes about and how it differs from the proof of a simple statement.
Paragraph 2 Having made these distinctions we next point out that the expression 'to be possible' is used in two ways.
Paragraph 3 That which is possible in each of its two senses is convertible into its opposite, not however in the same way:
Paragraph 4 These matters will be treated more definitely in the sequel;

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