Combining Texts

All the ideas for 'The Value of Science', 'Essays on Intellectual Powers 4: Conception' and 'A Completeness Theorem in Modal Logic'

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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]

9. Objects / D. Essence of Objects / 4. Essence as Definition

23647

Objects have an essential constitution, producing its qualities, which we are too ignorant to define [Reid]

10. Modality / D. Knowledge of Modality / 4. Conceivable as Possible / b. Conceivable but impossible

11958

Impossibilites are easily conceived in mathematics and geometry [Reid, by Molnar]

19. Language / B. Reference / 1. Reference theories

23646

Reference is by name, or a term-plus-circumstance, or ostensively, or by description [Reid]

19. Language / B. Reference / 3. Direct Reference / c. Social reference

23645

A word's meaning is the thing conceived, as fixed by linguistic experts [Reid]

26. Natural Theory / D. Laws of Nature / 11. Against Laws of Nature

15877

The aim of science is just to create a comprehensive, elegant language to describe brute facts [Poincaré, by Harré]