### Single Idea 16456

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

Full Idea

Lewis was suspicious of boxes and diamonds as regimenting ordinary modal thought, …preferring a first-order extensional theory including possible worlds in its domain and an indexical singular term for the actual world.

Gist of Idea

For modality Lewis rejected boxes and diamonds, preferring worlds, and an index for the actual one

Source

report of David Lewis (Anselm and Actuality [1970]) by Robert C. Stalnaker - Mere Possibilities 3.8

Book Reference

Stalnaker,Robert C.: 'Mere Possibilities' [Princeton 2012], p.83