Single Idea 21608

[catalogued under 7. Existence / D. Theories of Reality / 10. Vagueness / f. Supervaluation for vagueness]

Full Idea

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

Clarification

Truth-functionality is building up truth from components

Gist of Idea

Truth-functionality for compound statements fails in supervaluation

Source

Timothy Williamson (Vagueness [1994], 5.3)

Book Reference

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


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.

Related Idea

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