Combining Texts

All the ideas for 'Real Natures and Familiar Objects', 'A Completeness Theorem in Modal Logic' and 'Counterfactual Dependence and Time's Arrow'

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10 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]

8. Modes of Existence / B. Properties / 1. Nature of Properties

13795

Properties only have identity in the context of their contraries [Elder]

9. Objects / B. Unity of Objects / 3. Unity Problems / c. Statue and clay

13798

Maybe we should give up the statue [Elder]

9. Objects / D. Essence of Objects / 6. Essence as Unifier

13797

The loss of an essential property means the end of an existence [Elder]

9. Objects / D. Essence of Objects / 9. Essence and Properties

13794

Essential properties by nature occur in clusters or packages [Elder]

13796

Essential properties are bound together, and would be lost together [Elder]

26. Natural Theory / C. Causation / 5. Direction of causation

8433	There are few traces of an event before it happens, but many afterwards [Lewis, by Horwich]