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'works', 'Symbolic Reasoning' and 'Intro to Gdel's Theorems'
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4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set
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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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There cannot be a set theory which is complete [Smith,P]
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