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Aristotle - The Organon - index for TOPICA Book 2 Part 7

Contraries and their conjunctions

  
Paragraph 1 Inasmuch as contraries can be conjoined with each other in six ways, and four of these conjunctions constitute a contrariety, we must grasp the subject of contraries, in order that it may help us both in demolishing and in establishing a view.
Paragraph 2 The first two then of the aforesaid conjunctions do not constitute any contrariety;
Paragraph 3 Moreover, if the accident of a thing have a contrary, see whether it belongs to the subject to which the accident in question has been declared to belong:
Paragraph 4 Or again, look and see if anything has been said about something, of such a kind that if it be true, contrary predicates must necessarily belong to the thing:
Paragraph 5 Again, if there be posited an accident which has a contrary, look and see if that which admits of the accident will admit of its contrary as well:


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