•Classical theory – a category is definable.
–Certain properties are present or absent. Example: a chair has a seat. A briefcase has a handle.
–Eventually, these bottom-out in something verifiable by senses.
–Category membership is binary.
–Intuitive: we think things have definitions.
–Held with little question for ~2,000 years.
–Initial focus of AI, cognitive science: eg., Schank, Hayes, expert systems, anthropology.
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