Ideas from 'Concepts without Boundaries' by Mark Sainsbury [1990], by Theme Structure
[found in 'Vagueness: a Reader' (ed/tr Keefe,R /Smith,P) [MIT 1999,0-262-61145-7]].
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7. Existence / D. Theories of Reality / 10. Vagueness / b. Vagueness of reality
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If 'red' is vague, then membership of the set of red things is vague, so there is no set of red things
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7. Existence / E. Categories / 2. Categorisation
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We should abandon classifying by pigeon-holes, and classify around paradigms
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9. Objects / B. Unity of Objects / 3. Unity Problems / e. Vague objects
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Vague concepts are concepts without boundaries
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If concepts are vague, people avoid boundaries, can't spot them, and don't want them
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Boundaryless concepts tend to come in pairs, such as child/adult, hot/cold
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