Combining Texts

All the ideas for 'Identity and Spatio-Temporal Continuity', 'Principles of Theoretical Logic' and 'Types and Ontology'

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3 ideas

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

17750

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

7. Existence / E. Categories / 1. Categories

13127

Categories can't overlap; they are either disjoint, or inclusive [Sommers, by Westerhoff]

9. Objects / A. Existence of Objects / 5. Individuation / e. Individuation by kind

13128

'Ultimate sortals' cannot explain ontological categories [Westerhoff on Wiggins]