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Single Idea 21618

[filed under theme 7. Existence / D. Theories of Reality / 10. Vagueness / d. Vagueness as linguistic ]

Full Idea

If vague utterances in borderline cases fail to say anything, then if 'TW is thin' is vague, and TW has a twin of identical dimensions, it still seems that 'If TW is thin then his twin is thin' must be true, and so it must have said something.

Gist of Idea

If the vague 'TW is thin' says nothing, what does 'TW is thin if his perfect twin is thin' say?

Source

Timothy Williamson (Vagueness [1994], 7.2 (d))

Book Ref

Williamson,Timothy: 'Vagueness' [Routledge 1996], p.196

A Reaction

This an objection to the Fregean 'nihilistic' view of Idea 21614. I am inclined to a solution based on the proposition expressed, rather than the sentence. The first question is whether you are willing to assert 'TW is thin'.

Related Ideas

Idea 21614 The 'nihilist' view of vagueness says that 'heap' is not a legitimate concept [Williamson]

Idea 21617 We can say propositions are bivalent, but vague utterances don't express a proposition [Williamson]

The 18 ideas with the same theme [vagueness as indecision about word meanings]:

17431 Vagueness is incomplete definition [Frege, by Koslicki]
9051 Since natural language is not precise it cannot be in the province of logic [Russell, by Keefe/Smith]
9054 Vagueness is only a characteristic of representations, such as language [Russell]
19042 Terms learned by ostension tend to be vague, because that must be quick and unrefined [Quine]
8180 'That is red or orange' might be considered true, even though 'that is red' and 'that is orange' were not [Dummett]
9052 Vague predicates lack application; there are no borderline cases; vague F is not F [Unger, by Keefe/Smith]
15538 Semantic indecision explains vagueness (if we have precisifications to be undecided about) [Lewis]
9057 Vagueness is semantic indecision: we haven't settled quite what our words are meant to express [Lewis]
9671 Whether or not France is hexagonal depends on your standards of precision [Lewis]
16458 Semantic vagueness involves alternative and equal precisifications of the language [Lewis]
17582 Singular terms can be vague, because they can contain predicates, which can be vague [Inwagen]
12023 Vagueness problems arise from applying sharp semantics to vague languages [Forbes,G]
9768 Vagueness is semantic, a deficiency of meaning [Fine,K]
21614 The 'nihilist' view of vagueness says that 'heap' is not a legitimate concept [Williamson]
21617 We can say propositions are bivalent, but vague utterances don't express a proposition [Williamson]
21618 If the vague 'TW is thin' says nothing, what does 'TW is thin if his perfect twin is thin' say? [Williamson]
21625 The vagueness of 'heap' can remain even when the context is fixed [Williamson]
11016 Would a language without vagueness be usable at all? [Read]