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9585 | Since every definition is an equation, one cannot define equality itself [Frege] |
Full Idea: Since every definition is an equation, one cannot define equality itself. | |
From: Gottlob Frege (Review of Husserl's 'Phil of Arithmetic' [1894], p.327) | |
A reaction: This seems a particularly nice instance of the general rule that 'you have to start somewhere'. It is a nice test case for the nature of meaning to ask 'what do you understand when you understand equality?', given that you can't define it. |