Combining Texts

All the ideas for 'Letters to a German Princess', 'Barcan Formulae' and 'Model Theory for Modal Logic I'

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3 ideas

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5

9560	S5 provides the correct logic for necessity in the broadly logical sense [Fine,K]

4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula

15380

Barcan:nothing comes into existence; Converse:nothing goes out; Both:domain is unchanging [Vervloesem]

26. Natural Theory / D. Laws of Nature / 1. Laws of Nature

5467	Euler said nature is instrinsically passive, and minds cause change [Euler, by Ellis]