Published online by Cambridge University Press: 02 August 2017
Let $E_{\unicode[STIX]{x1D706}}$ be the Legendre family of elliptic curves. Given
$n$ points
$P_{1},\ldots ,P_{n}\in E_{\unicode[STIX]{x1D706}}(\overline{\mathbb{Q}(\unicode[STIX]{x1D706})})$, linearly independent over
$\mathbb{Z}$, we prove that there are at most finitely many complex numbers
$\unicode[STIX]{x1D706}_{0}$ such that
$E_{\unicode[STIX]{x1D706}_{0}}$ has complex multiplication and
$P_{1}(\unicode[STIX]{x1D706}_{0}),\ldots ,P_{n}(\unicode[STIX]{x1D706}_{0})$ are linearly dependent over End
$(E_{\unicode[STIX]{x1D706}_{0}})$. This implies a positive answer to a question of Bertrand and, combined with a previous work in collaboration with Capuano, proves the Zilber–Pink conjecture for a curve in a fibered power of an elliptic scheme when everything is defined over
$\overline{\mathbb{Q}}$.
F. B. was supported by the EPSRC grant EP/N007956/1’ and the SNF grant 165525.