Combining Philosophers

Ideas for Roger Penrose, Chris Swoyer and Hugh MacColl

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2 ideas

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]

4. Formal Logic / F. Set Theory ST / 5. Conceptions of Set / e. Iterative sets

10405

In the iterative conception of sets, they form a natural hierarchy [Swoyer]