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]