Combining Philosophers

Ideas for Eubulides, Rita Carter and Robert C. Stalnaker

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3 ideas

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 / D. Modal Logic ML / 7. Barcan Formula

18823

To say there could have been people who don't exist, but deny those possible things, rejects Barcan [Stalnaker, by Rumfitt]

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]