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Ideas for 'fragments/reports', 'Elucidation of some points in E.Schrder' and 'Scientific Essentialism'

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2 ideas

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5

13604

Real possibility and necessity has the logic of S5, which links equivalence classes of worlds of the same kind [Ellis]

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]