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Aristotle - The Organon ANALYTICA POSTERIORA Book 1 Part 28

A single science is one whose domain is a single genus

1. A single science is one whose domain is a single genus, viz. all the subjects constituted out of the primary entities of the genus - i.e. the parts of this total subject - and their essential properties.

2. One science differs from another when their basic truths have neither a common source nor are derived those of the one science from those the other. This is verified when we reach the indemonstrable premisses of a science, for they must be within one genus with its conclusions: and this again is verified if the conclusions proved by means of them fall within one genus - i.e. are homogeneous.


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