Combining Texts

All the ideas for 'A Completeness Theorem in Modal Logic', 'Letter to Bramhall' and 'Leibniz: Guide for the Perplexed'

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7 ideas

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

10163

Propositional modal logic has been proved to be complete [Kripke, by Feferman/Feferman]

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

10760

With possible worlds, S4 and S5 are sound and complete, but S1-S3 are not even sound [Kripke, by Rossberg]

4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula

16189

The variable domain approach to quantified modal logic invalidates the Barcan Formula [Kripke, by Simchen]

15132

The Barcan formulas fail in models with varying domains [Kripke, by Williamson]

9. Objects / B. Unity of Objects / 2. Substance / d. Substance defined

19347

Substance needs independence, unity, and stability (for individuation); also it is a subject, for predicates [Perkins]

9. Objects / C. Structure of Objects / 2. Hylomorphism / a. Hylomorphism

16620

A chair is wood, and its shape is the form; it isn't 'compounded' of the matter and form [Hobbes]

9. Objects / D. Essence of Objects / 15. Against Essentialism

16622

Essence is just an artificial word from logic, giving a way of thinking about substances [Hobbes]