Aristotle - The Organon - index for ANALYTICA POSTERIORA Book 1 Part 3

Terminating regress in indemonstrable premisses

Paragraph 1 Some hold that, owing to the necessity of knowing the primary premisses, there is no scientific knowledge.
Paragraph 2 Our own doctrine is that not all knowledge is demonstrative:
Paragraph 3 Now demonstration must be based on premisses prior to and better known than the conclusion;
Paragraph 4 The advocates of circular demonstration are not only faced with the difficulty we have just stated:
Paragraph 5 Now, it has been shown that the positing of one thing - be it one term or one premiss - never involves a necessary consequent:

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