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Ideas for 'fragments/reports', 'Grundgesetze der Arithmetik 2 (Basic Laws)' and 'Explanations in reply to Mr Bradley'

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9. Objects / B. Unity of Objects / 3. Unity Problems / e. Vague objects

9891	The first demand of logic is of a sharp boundary [Frege]
	Full Idea: The first demand of logic is of a sharp boundary.
	From: Gottlob Frege (Grundgesetze der Arithmetik 2 (Basic Laws) [1903], §160), quoted by Michael Dummett - Frege philosophy of mathematics Ch.22
	A reaction: Nothing I have read about vagueness has made me doubt Frege's view of this, although precisification might allow you to do logic with vague concepts without having to finally settle where the actual boundaries are.