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Ideas for 'The Tragedy of Reason', 'Review of Husserl's 'Phil of Arithmetic'' and 'Causation'

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4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / e. Axioms of PL

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.