Single Idea 8260

[catalogued under 10. Modality / A. Necessity / 6. Logical Necessity]

Full Idea

'Strict' logical necessity is true by the laws of logic alone; 'narrow' logical necessity is true by the laws of logic plus definitions of non-logical terms; 'broad' logical necessity is true in every possible world where the laws of logic hold.

Gist of Idea

Logical necessity can be 'strict' (laws), or 'narrow' (laws and definitions), or 'broad' (all logical worlds)

Source

E.J. Lowe (The Possibility of Metaphysics [1998], 1.4)

Book Reference

Lowe,E.J.: 'The Possibility of Metaphysics' [OUP 2001], p.14


A Reaction

Lowe then says the third is close to 'metaphysical' necessity. I am unable to distinguish the third from the first. You can't claim that a logical implication holds in this world, but not in another possible world which has the same rules of implication.