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Axioms for Intuitionistic Mathematics Incompatible with Classical Logic

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Logic, Foundations of Mathematics, and Computability Theory

Part of the book series: The University of Western Ontario Series in Philosophy of Science ((WONS,volume 9))

Abstract

Standard formalizations of constructive mathematics (’constructive’ here in the narrow sense of Bishop (1967): choice sequences are regarded as inacceptable, and Church’s thesis is not assumed) can be carried out in formal systems based on intuitionistic logic which become classical formal systems on addition of the principle of the excluded third. The fact that in such systems for constructive mathematics the logical operations permit an interpretation different from the classical truth-functional one is then solely expressed by the fact that less axioms are assumed. As is well-known, this results in formal properties1 such as.

$$\begin{array}{l} \vdash A \vee B \Rightarrow {\rm{ }}{\mkern 1mu} \vdash A{\rm{ }}or \vdash B,\\ \vdash \exists xAx \Rightarrow \vdash At{\mkern 1mu} for{\rm{ }}some{\rm{ }}term{\rm{ }}t\left( {\exists xAx{\mkern 1mu} {\rm{ }}closed} \right). \end{array}$$

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© 1977 D. Reidel Publishing Company, Dordrecht, Holland

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Troelstra, A.S. (1977). Axioms for Intuitionistic Mathematics Incompatible with Classical Logic. In: Butts, R.E., Hintikka, J. (eds) Logic, Foundations of Mathematics, and Computability Theory. The University of Western Ontario Series in Philosophy of Science, vol 9. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-1138-9_4

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  • DOI: https://doi.org/10.1007/978-94-010-1138-9_4

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-1140-2

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