more from Gottlob Frege

Single Idea 9891

[catalogued under 9. Objects / B. Unity of Objects / 3. Unity Problems / e. Vague objects]

Full Idea

The first demand of logic is of a sharp boundary.

Gist of Idea

The first demand of logic is of a sharp boundary

Source

Gottlob Frege (Grundgesetze der Arithmetik 2 (Basic Laws) [1903], 160), quoted by Michael Dummett - Frege philosophy of mathematics Ch.22

Book Reference

Dummett,Michael: 'Frege: philosophy of mathematics' [Duckworth 1991], p.277


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.