Combining Texts

All the ideas for 'The Architecture of Theories', 'Barcan Formulae' and 'Symbolic Reasoning'

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

---

5 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]

4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set

21548

The null class is the class with all the non-existents as its members [MacColl, by Lackey]

17. Mind and Body / A. Mind-Body Dualism / 1. Dualism

14802

Physical and psychical laws of mind are either independent, or derived in one or other direction [Peirce]

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

14800

The world is full of variety, but laws seem to produce uniformity [Peirce]

27. Natural Reality / G. Biology / 3. Evolution

14801

Darwinian evolution is chance, with the destruction of bad results [Peirce]