Single Idea 9470

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

Full Idea

Modal logic is not an extensional language.

Gist of Idea

Modal logic is not an extensional language

Source

Charles Parsons (A Plea for Substitutional Quantification [1971], p.159 n8)

Book Reference

'Philosophy of Logic: an anthology', ed/tr. Jacquette,Dale [Blackwell 2002], p.159


A Reaction

[I record this for investigation. Possible worlds seem to contain objects]