Ideas from 'Anselm and Actuality' by David Lewis [1970], by Theme Structure

[found in 'Philosophical Papers Vol.1' by Lewis,David [OUP 1983,0-19-503204-7]].

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4. Formal Logic / D. Modal Logic ML / 4. Alethic Modal Logic
For modality Lewis rejected boxes and diamonds, preferring worlds, and an index for the actual one
                        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.
                        From: report of David Lewis (Anselm and Actuality [1970]) by Robert C. Stalnaker - Mere Possibilities 3.8