Combining Texts

All the ideas for 'Elucidation of some points in E.Schröder', 'The Structure of Science' and 'Letters to William Molyneux'

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

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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]

7. Existence / C. Structure of Existence / 2. Reduction

3425	Reduction has been defined as deriving one theory from another by logic and maths [Nagel,E, by Kim]

9. Objects / D. Essence of Objects / 13. Nominal Essence

12812

Things have real essences, but we categorise them according to the ideas we receive [Locke]