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Ideas for 'fragments/reports', 'Criterion of Validity in Reasoning' and 'Lecture on Nominalism'

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5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic

21698	All relations, apart from ancestrals, can be reduced to simpler logic [Quine]
	Full Idea: Much of the theory of relations can be developed as a virtual theory, in which we seem to talk of relations, but can explain our notation in terms {finally] of just the logic of truth-functions, quantification and identity. The exception is ancestrals.
	From: Willard Quine (Lecture on Nominalism [1946], §8)
	A reaction: The irreducibility of ancestrals is offered as a reason for treating sets as universals.