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Ideas for 'works', 'Whitehead and the Rise of Modern Logic' and 'The Blue and Brown Notebooks'

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5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic

13639	Quine says higher-order items are intensional, and lack a clearly defined identity relation [Quine, by Shapiro]
	Full Idea: Quine (in 1941) attacked 'Principia Mathematica' because the items in the range of higher-order variables (attributes etc) are intensional and thus do not have a clearly defined identity relation.
	From: report of Willard Quine (Whitehead and the Rise of Modern Logic [1941]) by Stewart Shapiro - Foundations without Foundationalism 1.3