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

Journal of Symbolic Logic 68 (1):262-266 (2003)
A natural problem from elementary arithmetic which is so strongly undecidable that it is not even Trial and Error decidable (in other words, not decidable in the limit) is presented. As a corollary, a natural, elementary arithmetical property which makes a difference between intuitionistic and classical theories is isolated.
Keywords Undecidability  Logic  Intuitionism
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DOI 10.2178/jsl/1045861513
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