Combining Texts

All the ideas for 'Science and Method', 'Barcan Formulae' and 'Conditional Assertion and Restricted Quantification'

expand these ideas     |    start again     |     specify just one area for these texts

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3 ideas

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]

6. Mathematics / A. Nature of Mathematics / 2. Geometry

10245

One geometry cannot be more true than another [Poincaré]

14. Science / C. Induction / 5. Paradoxes of Induction / b. Raven paradox

19000

Read 'all ravens are black' as about ravens, not as about an implication [Belnap]