SELF-REFERENCE IN ARITHMETIC II.

In this sequel to Self-reference in arithmetic I we continue our discussion of the question: What does it mean for a sentence of arithmetic to ascribe to itself a property? We investigate how the properties of the supposedly self-referential sentences depend on the chosen coding, the formulae expres...

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Bibliographic Details
Published in:Review of Symbolic Logic Vol. 7; no. 4; pp. 692 - 713
Main Authors: HALBACH, VOLKER, VISSER, ALBERT
Format: Article
Published: Cambridge University Press Dec2014
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Online Access:View this record in EBSCOhost
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Summary:In this sequel to Self-reference in arithmetic I we continue our discussion of the question: What does it mean for a sentence of arithmetic to ascribe to itself a property? We investigate how the properties of the supposedly self-referential sentences depend on the chosen coding, the formulae expressing the properties and the way a fixed point for the expressing formulae are obtained. In this second part we look at some further examples. In particular, we study sentences apparently expressing their Rosser-provability, their own ${\rm{\Sigma }}_n^0$-truth or their own ${\rm{\Pi }}_n^0$-truth. Finally we offer an assessment of the results of both papers.