Some strongly undecidable natural arithmetical problems, with an application to intuitionistic theories

Journal of Symbolic Logic 68 (1):262-266 (2003)
Abstract
Although Church and Turing presented their path-breaking undecidability results immediately after their explication of effective decidability in 1936, it has been generally felt that these results do not have any direct bearing on ordinary mathematics but only contribute to logic, metamathematics and the theory of computability. Therefore it was such a celebrated achievement when Yuri Matiyasevich in 1970 demonstrated that the problem of the solvability of Diophantine equations is undecidable. His work was building essentially on the earlier work by Julia Robinson, Martin Davis and Hilary Putnam (1961), who had showed that the problem of solvability of exponential Diophantine equations is undecidable. One should note, however, that although it was only Matiyasevich’s result which finally solved Hilbert’s tenth problem, already the earlier result had provided a perfectly natural problem of ordinary number theory which is undecidable.
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