Aristotle - The Organon - index for ANALYTICA POSTERIORA Book 1 Part 27

Exactness and priority in science

Paragraph 1 The science which is knowledge at once of the fact and of the reasoned fact, not of the fact by itself without the reasoned fact, is the more exact and the prior science.
Paragraph 2 A science such as arithmetic, which is not a science of properties qua inhering in a substratum, is more exact than and prior to a science like harmonics, which is a science of pr,operties inhering in a substratum;

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