The full Mordell–Lang conjecture for abelian varieties over function fields

Let pp be a prime, let kk be a finite field of characteristic pp, let K/kK/k be a regular extension with algebraic closure KKK\subseteq\overline K, and let AA be a KK-abelian variety. Let XAKX\subseteq A_{\overline K} be an irreducible K\overline K-subvariety and let ΓA(K)\Gamma\subseteq A(\overline K) be a finite-rank subgroup, meaning that ΓZQ\Gamma\otimes_{\mathbb{Z}}\mathbb{Q} has finite dimension over Q\mathbb{Q}. Assume that X(K)ΓX(\overline K)\cap\Gamma is Zariski dense in XX. The full Mordell–Lang conjecture. Then there exist an abelian variety A0A_0 over FpK\overline{\mathbb{F}}_p\subseteq\overline K, an Fp\overline{\mathbb{F}}_p-subvariety X0A0X_0\subseteq A_0, a surjective morphism h:AA0×FpKh:A\rightarrow A_0\times_{\overline{\mathbb{F}}_p}K, and an xA(K)x\in A(\overline K) such that

X=x+h1(X0).X=x+h^{-1}(X_0).

This is the full Mordell–Lang statement recalled as motivation for the paper. In the source it is stated as a conjecture and is reported to be proved by Hrushovski in the important case where ΓZp\Gamma\otimes\mathbb{Z}_p is a finitely generated Zp\mathbb{Z}_p-module; accordingly, its database status is solved.

Sources & referencesView supporting material

Primary source

Emiliano Ambrosi, “Perfect points of abelian varieties”, arXiv:2103.16568 (2023).

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