Combining Texts

All the ideas for 'works', 'Elucidation of some points in E.Schrder' and 'De primae philosophiae emendatione'

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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 / 4. Substitutional Quantification

10800

The values of variables can't determine existence, because they are just expressions [Ryle, by Quine]

9. Objects / B. Unity of Objects / 2. Substance / a. Substance

12716

The concept of forces or powers best reveals the true concept of substance [Leibniz]