Combining Texts

All the ideas for 'Isagoge ('Introduction')', 'Principles of Theoretical Logic' and 'Unity of Science as a Working Hypothesis'

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

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3 ideas

4. Formal Logic / C. Predicate Calculus PC / 1. Predicate Calculus PC

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The first clear proof of the consistency of the first order predicate logic was in 1928 [Hilbert/Ackermann, by Walicki]

8. Modes of Existence / D. Universals / 1. Universals

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Are genera and species real or conceptual? bodies or incorporeal? in sensibles or separate from them? [Porphyry]

14. Science / D. Explanation / 2. Types of Explanation / j. Explanations by reduction

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Six reduction levels: groups, lives, cells, molecules, atoms, particles [Putnam/Oppenheim, by Watson]