Combining Texts

Ideas for 'fragments/reports', 'On Interpretation' and 'On Formally Undecidable Propositions'

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7 ideas

5. Theory of Logic / D. Assumptions for Logic / 1. Bivalence

21593

In talking of future sea-fights, Aristotle rejects bivalence [Aristotle, by Williamson]

5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle

1701	A prayer is a sentence which is neither true nor false [Aristotle]

5. Theory of Logic / K. Features of Logics / 1. Axiomatisation

17886

The limitations of axiomatisation were revealed by the incompleteness theorems [Gödel, by Koellner]

5. Theory of Logic / K. Features of Logics / 2. Consistency

10071

Second Incompleteness: nice theories can't prove their own consistency [Gödel, by Smith,P]

5. Theory of Logic / K. Features of Logics / 3. Soundness

19123

If soundness can't be proved internally, 'reflection principles' can be added to assert soundness [Gödel, by Halbach/Leigh]

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

10621

Gödel's First Theorem sabotages logicism, and the Second sabotages Hilbert's Programme [Smith,P on Gödel]

17888

The undecidable sentence can be decided at a 'higher' level in the system [Gödel]