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Published online by Cambridge University Press: 03 November 2025
Given r non-zero rational numbers
$a_1, \ldots, a_r$ which are not
$\pm1$, we complete, under Hypothesis H, a characterisation of the Schinzel–Wójcik r-rational tuples (i.e. r-tuples of rational numbers for which the Schinzel–Wójcik problem has an affirmative answer) which satisfy that the sum of the exponents of the positive elements
$a_i$ in the representation of
$-1$ in terms of the elements
$a_i$ in the multiplicative group
$\langle a_1,\dots, a_r\rangle\subset \mathbb{Q}^*$ is even whenever
$-1 \in \langle a_1,\dots, a_r\rangle.$