Undecidable extensions of Büchi arithmetic and Cobham-Semënov Theorem

Journal of Symbolic Logic 62 (4):1280-1296 (1997)
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Abstract

Letkandlbe two multiplicatively independent integers, and letL⊆ ℕnbe al-recognizable set which is not definable in 〈ℕ; +〉. We prove that the elementary theory of 〈ℕ; +,Vk, L〉, whereVk(x)denotes the greatest power ofkdividingx, is undecidable. This result leads to a new proof of the Cobham-Semënov theorem.

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