### Single Idea 16985

#### [catalogued under 4. Formal Logic / D. Modal Logic ML / 1. Modal Logic]

Full Idea

The main and the original motivation for the 'possible worlds analysis' - and the way it clarified modal logic - was that it enabled modal logic to be treated by the same set theoretic techniques of model theory used successfully in extensional logic.

Gist of Idea

Possible worlds allowed the application of set-theoretic models to modal logic

Source

Saul A. Kripke (Naming and Necessity preface [1980], p.19 n18)

Book Reference

Kripke,Saul: 'Naming and Necessity' [Blackwell 1980], p.19

A Reaction

So they should be ascribed the same value that we attribute to classical model theory, whatever that is.