Combining Philosophers
Ideas for Hermarchus, Richard Dedekind and William W. Tait
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4 ideas
4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set
9986
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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 / 3. Types of Set / d. Infinite Sets
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An infinite set maps into its own proper subset [Dedekind, by Reck/Price]
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / f. Axiom of Infinity V
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We have the idea of self, and an idea of that idea, and so on, so infinite ideas are available [Dedekind, by Potter]
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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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