Combining Texts

All the ideas for 'fragments/reports', 'A Completeness Theorem in Modal Logic' and 'Essays on Intellectual Powers 1: Preliminary'

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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]

12. Knowledge Sources / E. Direct Knowledge / 1. Common Sense

23633

Many truths seem obvious, and point to universal agreement - which is what we find [Reid]

18. Thought / C. Content / 2. Ideas

23630

Only philosophers treat ideas as objects [Reid]

19. Language / A. Nature of Meaning / 9. Ambiguity

23629

The ambiguity of words impedes the advancement of knowledge [Reid]

23. Ethics / C. Virtue Theory / 1. Virtue Theory / a. Nature of virtue

467	A virtue is a combination of intelligence, strength and luck [Ion]

26. Natural Theory / C. Causation / 1. Causation

23632

Similar effects come from similar causes, and causes are only what are sufficient for the effects [Reid]