Combining Texts

All the ideas for 'fragments/reports', 'Manuscript remains' and 'A Completeness Theorem in Modal Logic'

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9 ideas

1. Philosophy / D. Nature of Philosophy / 1. Philosophy

21916

Philosophers can't be religious, and don't need to be; philosophy is perilous but free [Schopenhauer]

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]

20. Action / B. Preliminaries of Action / 2. Willed Action / a. Will to Act

21924

As the subject of willing I am wretched, but absorption in knowledge is bliss [Schopenhauer]

22. Metaethics / A. Ethics Foundations / 2. Source of Ethics / b. Rational ethics

21915

To deduce morality from reason is blasphemy, because it is holy, and far above reason [Schopenhauer]

25. Social Practice / E. Policies / 5. Education / b. Education principles

13304

Learned men gain more in one day than others do in a lifetime [Posidonius]

27. Natural Reality / D. Time / 1. Nature of Time / d. Time as measure

20820

Time is an interval of motion, or the measure of speed [Posidonius, by Stobaeus]