Combining Texts
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'The Languages of Art', 'New Foundations for Mathematical Logic' and 'Symbolic Reasoning'
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2 ideas
4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set
21548
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The null class is the class with all the non-existents as its members [MacColl, by Lackey]
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets
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NF has no models, but just blocks the comprehension axiom, to avoid contradictions [Quine, by Dummett]
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