Combining Texts

Ideas for 'Symbolic Reasoning', 'Anarchical Fallacies: on the Declaration of Rights' and 'The Runabout Inference Ticket'

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4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set
The null class is the class with all the non-existents as its members [MacColl, by Lackey]