more from Nathan Salmon

### Single Idea 14693

#### [catalogued under 4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5]

Full Idea

Counterpart-theoretic modal semantics allows for the retention of S5 modal propositional logic, at a considerable cost.

Gist of Idea

The unsatisfactory counterpart-theory allows the retention of S5

Source

Nathan Salmon (The Logic of What Might Have Been [1989], V n18)

Book Reference

Salmon,Nathan: 'Metaphysics, Mathematics and Meaning' [OUP 2005], p.149

A Reaction

See the other ideas in this paper by Salmon for his general attack on S5 as the appropriate system for metaphysical necessity. He favours the very modest System T.