Full Idea
With its freedom from the constraint of metaphysical possibility, logical necessity may be construed as accommodating all the axioms and rules of S5.
Gist of Idea
Logical necessity is free of constraints, and may accommodate all of S5 logic
Source
Nathan Salmon (The Logic of What Might Have Been [1989], III)
Book Reference
Salmon,Nathan: 'Metaphysics, Mathematics and Meaning' [OUP 2005], p.137
A Reaction
He goes on to raise problems for this simple thought. The big question: what are the limits of what is actually possible? Compare: what are the limits of what is imaginable? what are the limits of what is meaningfully sayable?
Related Idea
Idea 14679 Bizarre identities are logically but not metaphysically possible, so metaphysical modality is restricted [Salmon,N]