### Single Idea 7689

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

Full Idea

The modal syntax and axiom systems of C.I.Lewis (1918) were formally interpreted by Kripke and Hintikka (c.1965) who, using Z-F set theory, worked out model set-theoretical semantics for modal logics and quantified modal logics.

Clarification

Z-F stands for Zermelo-Fraenkel

Gist of Idea

The modal logic of C.I.Lewis was only interpreted by Kripke and Hintikka in the 1960s

Source

Dale Jacquette (Ontology [2002], Ch. 2)

Book Reference

Jacquette,Dale: 'Ontology' [Acumen 2002], p.70

A Reaction

A historical note. The big question is always 'who cares?' - to which the answer seems to be 'lots of people', if they are interested in precision in discourse, in artificial intelligence, and maybe even in metaphysics. Possible worlds started here.