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Single Idea 21608

[catalogued under 7. Existence / D. Theories of Reality / 9. Vagueness / f. Supervaluation for vagueness]

Full Idea

A striking fearure of supervaluations is the failure of truth-functionality for compound statements.

Gist of Idea

Truth-functionality for compound statements fails in supervaluation


Timothy Williamson (Vagueness [1994], 5.3)

A Reaction

Supervaluations has the initial appearance of enhancing classical logic, but turns out to somewhat undermine it. Hence Williamson's lack of sympathy. But see Idea 21610.

Book Reference

Williamson,Timothy: 'Vagueness' [Routledge 1996], p.146

Related Idea

Idea 21607 Supervaluation has excluded middle but not bivalence; 'A or not-A' is true, even when A is undecided [Williamson]