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2023/102/3-4 (11) — DOI: 10.5486/PMD.2023.9445 — pp. 439-457

On families of cubic split Thue equations parametrised by linear recurrence sequences

Authors: Tobias Hilgart

Abstract:

Let $(A_n)_{n\in \mathbb{N}}$, $(B_n)_{n\in \mathbb{N}} \in \mathbb{Z}^{\mathbb{N}}$ be two linear-recurrent sequences that meet a dominant root condition and a few more technical requirements. We show that the split family of Thue equations $$ |X(X-A_n Y)(X-B_nY) - Y^3| = 1 $$ has but the trivial solutions $\pm\{ (0,1), (1,0), (A_n,1), (B_n,1)\}$, if the parameter $n$ is larger than some effectively computable constant.

Keywords: parametrised Thue equations, linear recurrence sequences

Mathematics Subject Classification: 11D25