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'works', 'Symbolic Reasoning' and 'Plato on Parts and Wholes'
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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 / G. Formal Mereology / 1. Mereology
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Mereology began as a nominalist revolt against the commitments of set theory [Harte,V]
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