The book defines differentia (fasl) as an essential universal that distinguishes one specific essence from other specific essences.
In classical logic, 'rational' is the differentia of a human. In 'rational animal,' animal provides the shared genus, and rational provides the specific distinction.
The differentia is essential; it is not merely another descriptive word.
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Definition of differentia
The Five Universals: Genus, Species, Differentia, Property, Common Accident
The book defines differentia (fasl) as an essential universal that distinguishes one specific essence from other specific essences.
In classical logic, 'rational' is the differentia of a human. In 'rational animal,' animal provides the shared genus, and rational provides the specific distinction.
The differentia is essential; it is not merely another descriptive word.