Combining Texts

All the ideas for 'works', 'Counterfactual Dependence and Time's Arrow' 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]

5. Theory of Logic / G. Quantification / 2. Domain of Quantification

17743

De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [De Morgan, by Walicki]

26. Natural Theory / C. Causation / 5. Direction of causation

8433	There are few traces of an event before it happens, but many afterwards [Lewis, by Horwich]