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Necessitarian accounts of the laws of nature have an apparent difficulty in
accounting for counterlegal conditionals because, despite appearing to be
substantive, on the necessitarian thesis they are vacuous. I argue that
the necessitarian may explain the apparently substantive content of such
conditionals by pointing out the presuppositions of counterlegal discourse.
The typical presupposition is that a certain conceptual possibility has
been realized; namely, that necessitarianism is false. (The idea of
conceptual possibility is explicated in terms of recent work in
two-dimensional modal semantics.) If this sort of presupposition is made
explicit in counterlegal utterances, we obtain a sentence such as: 'If it
turns out that the laws of nature are contingent, then if the laws had been
otherwise, then such and such would have been the case.' Sentences of this
type are non-vacuous, and very often true. I argue that this goes a long
way towards resolving the difficulty for necessitarianism.
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