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differentia
In Scholastic logic, differentia is one of the predicables. It is that part of a definition which is predicable in a given genus only of the definiendum; or the corresponding "metaphysical part" of the object.
==Origin of the notion==
The concept of differentia was, as a matter of fact, already employed by Plato when he conceived his method of ''diairesis''. Aristotle used the term ''diafora'' in a systematical fashion; but he had no explicit theory about it and his understanding of the term is controversial. A theory was only provided by Porphyry's explicit treatment of the predicables presented in his ''Isagoge''. On the basis of Boethius' translation of the Isagoge, where the Greek term ''diafora'' was rendered as in Latin as "differentia", evolved the elaborate Scholastic theory of the predicables.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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