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Ideas for 'fragments/reports', 'What Mary Didn't Know' and 'Philosophy of Mathematics'

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9. Objects / B. Unity of Objects / 3. Unity Problems / e. Vague objects
A blurry border is still a border [Shapiro]
     Full Idea: A blurry border is still a border.
     From: Stewart Shapiro (Philosophy of Mathematics [1997], 8.3)
     A reaction: This remark deserves to be quoted in almost every area of philosophy, against those who attack a concept by focusing on its vague edges. Philosophers should focus on central cases, not borderline cases (though the latter may be of interest).