Aristotle - The Organon - index for CATEGORIAE Book 1 Part 3

Subclasses and predicability

Paragraph 1 When one thing is predicated of another, all that which is predicable of the predicate will be predicable also of the subject.
Paragraph 2 If genera are different and co-ordinate, their differentiae are themselves different in kind.
Paragraph 3 But where one genus is subordinate to another, there is nothing to prevent their having the same differentiae:

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