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 / 9. Vagueness / a. Vagueness of reality
If 'red' is vague, then membership of the set of red things is vague, so there is no set of red things
7. Existence / E. Categories / 2. Categorisation
We should abandon classifying by pigeon-holes, and classify around paradigms
9. Objects / B. Unity of Objects / 3. Unity Problems / e. Vague objects
Vague concepts are concepts without boundaries
If concepts are vague, people avoid boundaries, can't spot them, and don't want them
Boundaryless concepts tend to come in pairs, such as child/adult, hot/cold