Combining Texts

Ideas for 'Parmenides', 'Necessary Beings' and 'Letters to Queen Charlotte'

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5 ideas

5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic

19296

If second-order variables range over sets, those are just objects; properties and relations aren't sets [Hale]

5. Theory of Logic / C. Ontology of Logic / 4. Logic by Convention

19289

Maybe conventionalism applies to meaning, but not to the truth of propositions expressed [Hale]

5. Theory of Logic / H. Proof Systems / 4. Natural Deduction

19298

Unlike axiom proofs, natural deduction proofs needn't focus on logical truths and theorems [Hale]

5. Theory of Logic / L. Paradox / 3. Antinomies

13986

Plato found antinomies in ideas, Kant in space and time, and Bradley in relations [Plato, by Ryle]

14150

Plato's 'Parmenides' is perhaps the best collection of antinomies ever made [Russell on Plato]