Aristotle - The Organon - index for TOPICA Book 6 Part 1

The five parts of the discussion of definitions

Paragraph 1 The discussion of Definitions falls into five parts.
Paragraph 2 (1) that it is not true at all to apply the expression as well to that to which the term is applied (for the definition of Man ought to be true of every man);
Paragraph 3 (2) that though the object has a genus, he has failed to put the object defined into the genus, or to put it into the appropriate genus (for the framer of a definition should first place the object in its genus, and then append its differences:
Paragraph 4 (3) that the expression is not peculiar to the object (for, as we said above as well, a definition ought to be peculiar):
Paragraph 5 (4) see if, though he has observed all the aforesaid cautions, he has yet failed to define the object, that is, to express its essence.
Paragraph 6 (5) It remains, apart from the foregoing, to see if he has defined it, but defined it incorrectly.
Paragraph 7 Whether, then, the expression be not also true of that of which the term is true you should proceed to examine according to the commonplace rules that relate to Accident.
Paragraph 8 It remains, then, to prescribe how to investigate whether the object has been either not defined at all, or else defined incorrectly.
Paragraph 9 Incorrectness falls into two branches:

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