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Full Idea
A mythology gave us the idea that metaphysical necessity is truth in every world whatsoever, without restriction. But the notion of metaphysical modality comes first, and, like every notion of modality, it is restricted.
Gist of Idea
Metaphysical necessity is NOT truth in all (unrestricted) worlds; necessity comes first, and is restricted
Source
Nathan Salmon (The Logic of What Might Have Been [1989], IV)
Book Ref
Salmon,Nathan: 'Metaphysics, Mathematics and Meaning' [OUP 2005], p.141