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Ideas for 'fragments/reports', 'The Structure of Appearance' and 'Elucidation of some points in E.Schrder'

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3 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 / 5. Conceptions of Set / a. Sets as existing

15510

Classes are a host of ethereal, platonic, pseudo entities [Goodman]

4. Formal Logic / F. Set Theory ST / 8. Critique of Set Theory

9920	Two objects can apparently make up quite distinct arrangements in sets [Goodman, by Burgess/Rosen]