Although definitions are introduced as combinations of understood concepts, the textbook explicitly allows the proximate differentia alone as an incomplete ḥadd. “Rational,” in the book’s technical sense, points to the defining difference but omits the proximate genus. It conveys a useful essential distinction without giving the complete structure.
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Why the differentia alone can be an incomplete ḥadd
Definitions in Logic: Complete and Incomplete Ḥadd and Rasm
Although definitions are introduced as combinations of understood concepts, the textbook explicitly allows the proximate differentia alone as an incomplete ḥadd. “Rational,” in the book’s technical sense, points to the defining difference but omits the proximate genus. It conveys a useful essential distinction without giving the complete structure.