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'works', 'Realism' and 'Truth and Truthmakers'
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2 ideas
4. Formal Logic / F. Set Theory ST / 1. Set Theory
18396
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The set theory brackets { } assert that the member is a unit [Armstrong]
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4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set
18393
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For 'there is a class with no members' we don't need the null set as truthmaker [Armstrong]
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