# Mathematics of Computation

Published by the American Mathematical Society since 1960 (published as Mathematical Tables and other Aids to Computation 1943-1959), Mathematics of Computation is devoted to research articles of the highest quality in computational mathematics.

ISSN 1088-6842 (online) ISSN 0025-5718 (print)

The 2020 MCQ for Mathematics of Computation is 1.78.

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## On some Diophantine systems involving symmetric polynomialsHTML articles powered by AMS MathViewer

by Maciej Ulas
Math. Comp. 83 (2014), 1915-1930 Request permission

## Abstract:

Let $\sigma _{i}(x_{1},\ldots , x_{n})=\sum _{1\leq k_{1}<k_{2}<\ldots <k_{i}\leq n}x_{k_{1}}\ldots x_{k_{i}}$ be the $i$-th elementary symmetric polynomial. In this note we generalize and extend the results obtained in a recent work of Zhang and Cai. More precisely, we prove that for each $n\geq 4$ and rational numbers $a, b$ with $ab\neq 0$, the system of diophantine equations \begin{equation*} \sigma _{1}(x_{1},\ldots , x_{n})=a, \quad \sigma _{n}(x_{1},\ldots , x_{n})=b, \end{equation*} has infinitely many solutions depending on $n-3$ free parameters. A similar result is proved for the system \begin{equation*} \sigma _{i}(x_{1},\ldots , x_{n})=a, \quad \sigma _{n}(x_{1},\ldots , x_{n})=b, \end{equation*} with $n\geq 4$ and $2\leq i< n$. Here, $a, b$ are rational numbers with $b\neq 0$.

We also give some results concerning the general system of the form \begin{equation*} \sigma _{i}(x_{1},\ldots , x_{n})=a, \quad \sigma _{j}(x_{1},\ldots , x_{n})=b, \end{equation*} with suitably chosen rational values of $a, b$ and $i<j<n$. Finally, we present some remarks on the systems involving three different symmetric polynomials.

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