Combining Texts

All the ideas for 'On Motion', 'Does Moral Subjectivism Rest on a Mistake?' and 'A Completeness Theorem in Modal Logic'

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8 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]

22. Metaethics / A. Ethics Foundations / 1. Nature of Ethics / f. Ethical non-cognitivism

22485

Non-cognitivists give the conditions of use of moral sentences as facts about the speaker [Foot]

22. Metaethics / A. Ethics Foundations / 2. Source of Ethics / h. Expressivism

22486

The mistake is to think good grounds aren't enough for moral judgement, which also needs feelings [Foot]

22. Metaethics / B. Value / 1. Nature of Value / b. Fact and value

22487

Moral arguments are grounded in human facts [Foot]

27. Natural Reality / B. Modern Physics / 1. Relativity / a. Special relativity

12709

Motion is not absolute, but consists in relation [Leibniz]