Published in Volume XXIX, Issue 1, 2019, pages 101–111, doi: 10.7561/SACS.2019.1.101

Authors: A. Peszek, A. Tyszka

### Abstract

Let R be a non-zero subring of Q with or without 1. We assume that for every positive integer n there exists a computable surjection from N onto Rn . Every R ∈ {Z, Q} satisfies these conditions. Matiyasevich’s theorem states that there is no algorithm to decide whether or not a given Diophantine equation has a solution in non-negative integers. Smoryński’s theorem states that the set of all Diophantine equations which have at most finitely many solutions in non-negative integers is not recursively enumerable. We prove: (1) Smoryński’s theorem easily follows from Matiyasevich’s theorem, (2) Hilbert’s Tenth Problem for solutions in R has a positive solution if and only if the set of all Diophantine equations with a finite number of solutions in R is recursively enumerable. “Hilbert’s Tenth Problem for solutions in R” is the problem of whether there exists an algorithm which for any given Diophantine equation with integer coefficients, can decide whether the equation has a solution with all unknowns taking values in R.

Keywords: computable set, Davis-Putnam-Robinson-Matiyasevich theorem, Diophantine equation which has at most finitely many solutions, Hilbert’s Tenth Problem for solutions in a subring of Q, Matiyasevich’s theorem, recursively enumerable set, Smoryński’s theorem.

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### Bibtex

```@article{sacscuza:peszek2019orbmst,
title={On the Relationship Between Matiyasevich’s and Smoryński’s Theorems},
author={A. Peszek, A. Tyszka},
journal={Scientific Annals of Computer Science},
volume={29},
number={1},
organization={Alexandru Ioan Cuza University, Ia\c si, Rom\^ania},
year={2019},
pages={101–111},
publisher={Alexandru Ioan Cuza University Press, Ia\c si},
doi={10.7561/SACS.2019.1.101}
}```