Combining Philosophers

Ideas for Herodotus, Jonathan Schaffer and Hugh MacColl

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2 ideas

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / d. System T

14607

T adds □p→p for reflexivity, and is ideal for modeling lawhood [Schaffer,J]

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]