Combining Texts

Ideas for 'Commentary on 'De Anima'', 'Naming and Necessity lectures' and 'Mere Possibilities'

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3 ideas

4. Formal Logic / D. Modal Logic ML / 1. Modal Logic

10559

Kripke's modal semantics presupposes certain facts about possible worlds [Kripke, by Zalta]

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / a. Systems of modal logic

16468

Non-S5 can talk of contingent or necessary necessities [Stalnaker]

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / b. Axiom of Extensionality I

16449

In modal set theory, sets only exist in a possible world if that world contains all of its members [Stalnaker]