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Ideas for
'works', 'Symbolic Reasoning' and 'Function and Concept'
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2 ideas
4. Formal Logic / A. Syllogistic Logic / 2. Syllogistic Logic
18806
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Frege thought traditional categories had psychological and linguistic impurities [Frege, by Rumfitt]
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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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