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Ideas for 'Logicism and Ontological Commits. of Arithmetic', 'Varieties of Ontological Dependence' and 'Frege versus Cantor and Dedekind'

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2 ideas

4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set

9986	The null set was doubted, because numbering seemed to require 'units' [Tait]

4. Formal Logic / F. Set Theory ST / 7. Natural Sets

9984	We can have a series with identical members [Tait]