Combining Texts

All the ideas for 'Isagoge ('Introduction')', 'Frege on Apriority' and 'Barcan Formulae'

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

9159	You can't simply convert geometry into algebra, as some spatial content is lost [Burge]

8. Modes of Existence / D. Universals / 1. Universals

15034

Are genera and species real or conceptual? bodies or incorporeal? in sensibles or separate from them? [Porphyry]