Sortals, categories, and other properties
Sortals (horse, triangle, amount of matter, person, student...)
- Carry identity
- Hardly definable in terms of a few primitives
- High organizational utility
Categories (universal, particular, event, substance...)
- No identity
- Useful generalizations for sortals
- Characterized by a set of (only necessary) formal properties
- Good organizational utility
Other non-sortals (red, big, decomposable, eatable, dependent, singular...)
- No identity
- Span across different sortals
- Limited organizational utility (but high semantic value)