Aristotle - The Organon - index for ANALYTICA POSTERIORA Book 1 Part 21

That the regress of middles terminates

Paragraph 1 Further, if in affirmative demonstration the series terminates in both directions, clearly it will terminate too in negative demonstration.

Paragraph 2 The third figure shows it as follows:

Paragraph 3 Thus it is plain that the regress of middles terminates in the case of negative demonstration, if it does so also in the case of affirmative demonstration.

HTML by

created 1996/11/25 modified 2009/04/26


Paragraph 1	Further, if in affirmative demonstration the series terminates in both directions, clearly it will terminate too in negative demonstration.
Paragraph 2	The third figure shows it as follows:
Paragraph 3	Thus it is plain that the regress of middles terminates in the case of negative demonstration, if it does so also in the case of affirmative demonstration.