Combining Philosophers
Ideas for Archimedes, William W. Tait and Verity Harte
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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 set was doubted, because numbering seemed to require 'units' [Tait]
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4. Formal Logic / F. Set Theory ST / 7. Natural Sets
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We can have a series with identical members [Tait]
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