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