A rasm identifies a thing through a distinguishing feature treated as outside its essence. The book uses ḍāḥik, the capacity for laughter, as a traditional example of a human property. It is not the same logical role as nāṭiq, the essential differentia. The contrast is essential characterization versus recognition through a distinctive attribute.
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Descriptive definition (rasm) uses a property
Definitions in Logic: Complete and Incomplete Ḥadd and Rasm
A rasm identifies a thing through a distinguishing feature treated as outside its essence. The book uses ḍāḥik, the capacity for laughter, as a traditional example of a human property. It is not the same logical role as nāṭiq, the essential differentia. The contrast is essential characterization versus recognition through a distinctive attribute.