Combining Texts

All the ideas for 'works', 'Opus Maius (major works)' and 'Papers of 1913'

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3 ideas

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]

10. Modality / B. Possibility / 1. Possibility

22308

Only the actual exists, so possibilities always reduce to actuality after full analysis [Russell]

26. Natural Theory / D. Laws of Nature / 8. Scientific Essentialism / d. Knowing essences

16745

No one even knows the nature and properties of a fly - why it has that colour, or so many feet [Bacon,R]