The example dahhak should not be read as 'laughing at every moment.' Its classical logical point is the capacity for laughter, not the constant occurrence of the act.
A sleeping person is not laughing, yet their kind has not changed.
A silent person has not thereby lost every underlying capacity.
Distinguishing capacity from current action prevents an overly literal reading of the example.
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Capacity for laughter versus laughing now
The Five Universals: Genus, Species, Differentia, Property, Common Accident
The example dahhak should not be read as 'laughing at every moment.' Its classical logical point is the capacity for laughter, not the constant occurrence of the act.
A sleeping person is not laughing, yet their kind has not changed.
A silent person has not thereby lost every underlying capacity.
Distinguishing capacity from current action prevents an overly literal reading of the example.