Combining Texts

Ideas for 'On the Question of Absolute Undecidability', 'Lectures on Jurisprudence' and 'Necessary Beings'

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4 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 / K. Features of Logics / 5. Incompleteness

17894

We have no argument to show a statement is absolutely undecidable [Koellner]