Combining Texts

Ideas for 'On the Question of Absolute Undecidability', 'Identity and Necessity' and 'Gentzen's Analysis of First-Order Proofs'

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6 ideas

5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic

13831

Logic is based on transitions between sentences [Prawitz]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives

13825

Natural deduction introduction rules may represent 'definitions' of logical connectives [Prawitz]

5. Theory of Logic / F. Referring in Logic / 1. Naming / b. Names as descriptive

9175	We may fix the reference of 'Cicero' by a description, but thereafter the name is rigid [Kripke]

5. Theory of Logic / F. Referring in Logic / 1. Naming / c. Names as referential

9171	The function of names is simply to refer [Kripke]

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

13823

In natural deduction, inferences are atomic steps involving just one logical constant [Prawitz]

5. Theory of Logic / K. Features of Logics / 5. Incompleteness

17894

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