Wittgenstein on Pseudo-Irrationals, Diagonal Numbers and Decidability

In Lampert Timm (ed.), The Logica Yearbook 2008. pp. 95-111 (2008)
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Abstract

In his early philosophy as well as in his middle period, Wittgenstein holds a purely syntactic view of logic and mathematics. However, his syntactic foundation of logic and mathematics is opposed to the axiomatic approach of modern mathematical logic. The object of Wittgenstein’s approach is not the representation of mathematical properties within a logical axiomatic system, but their representation by a symbolism that identifies the properties in question by its syntactic features. It rests on his distinction of descriptions and operations; its aim is to reduce mathematics to operations. This paper illustrates Wittgenstein’s approach by examining his discussion of irrational numbers.

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Timm Lampert
Humboldt-University, Berlin

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