Combining Texts

Ideas for 'Substance and Individuation in Leibniz', 'Mere Possibilities' and 'Propositions'

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4 ideas

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

19209

Simple Quantified Modal Logc doesn't work, because the Converse Barcan is a theorem [Merricks]

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

19208

The Converse Barcan implies 'everything exists necessarily' is a consequence of 'necessarily, everything exists' [Merricks]

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]