Combining Texts

Ideas for 'Matter and Memory', 'Human Knowledge: its scope and limits' and 'Naming and Necessity preface'

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4. Formal Logic / D. Modal Logic ML / 1. Modal Logic
Possible worlds allowed the application of set-theoretic models to modal logic [Kripke]
     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.
     From: Saul A. Kripke (Naming and Necessity preface [1980], p.19 n18)
     A reaction: So they should be ascribed the same value that we attribute to classical model theory, whatever that is.