Two people may have similar height, clothing and facial features. If someone at a distance confuses them, that is uncertainty of identification, not numerical identity between the two people.
“Is that person Zayd or ʿAmr?”: two alternative possible identifications.
“Zayd and ʿAmr are human”: one human nature is predicated of both.
The first is about which individual has been perceived; the second is about sharing a single universal nature. The definition of universal concerns the second.
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Concepts: Particular and Universal, and Six Cases of Universals
Two people may have similar height, clothing and facial features. If someone at a distance confuses them, that is uncertainty of identification, not numerical identity between the two people.
“Is that person Zayd or ʿAmr?”: two alternative possible identifications.
“Zayd and ʿAmr are human”: one human nature is predicated of both.
The first is about which individual has been perceived; the second is about sharing a single universal nature. The definition of universal concerns the second.