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Ideas for 'works', 'The Limits of Contingency' and 'Elucidation of some points in E.Schrder'

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2 ideas

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

14238

A class is an aggregate of objects; if you destroy them, you destroy the class; there is no empty class [Frege]

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / c. Axiom of Pairing II

18851

Pairing (with Extensionality) guarantees an infinity of sets, just from a single element [Rosen]