Combining Texts

All the ideas for 'works', 'Certain Physical Essays' and 'Elucidation of some points in E.Schrder'

expand these ideas     |    start again     |     specify just one area for these texts

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4 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]

14. Science / D. Explanation / 1. Explanation / b. Aims of explanation

16736

Explanation is generally to deduce it from something better known, which comes in degrees [Boyle]

14. Science / D. Explanation / 3. Best Explanation / b. Ultimate explanation

16737

The best explanations get down to primary basics, but others go less deep [Boyle]