Single Idea 11083

[catalogued under 10. Modality / A. Necessity / 2. Nature of Necessity]

Full Idea

On my view, necessity is the truth of a sentence in every member of a set of possible worlds, together with its nonfalsity in every other possible worlds.

Gist of Idea

A sentence is necessary if it is true in a set of worlds, and nonfalse in the other worlds

Source

Robert Hanna (Rationality and Logic [2006], 6.6)

Book Reference

Hanna,Robert: 'Rationality and Logic' [MIT 2006], p.196