Combining Texts

All the ideas for 'Letters to Johann Bernoulli', 'A Completeness Theorem in Modal Logic' and 'Letters to De Vries'

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9 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]

7. Existence / C. Structure of Existence / 6. Fundamentals / c. Monads

13174

A piece of flint contains something resembling perceptions and appetites [Leibniz]

13175

Entelechies are analogous to souls, as other minds are analogous to our own minds [Leibniz]

9. Objects / D. Essence of Objects / 14. Knowledge of Essences

4869	Experience does not teach us any essences of things [Spinoza]

10. Modality / D. Knowledge of Modality / 4. Conceivable as Possible / c. Possible but inconceivable

13172

What we cannot imagine may still exist [Leibniz]

22. Metaethics / B. Value / 2. Values / e. Death

13173

Death is just the contraction of an animal [Leibniz]