Strengthened independence of intersection points conjecture

Let kk be a field that is not locally finite, let CC be a smooth projective curve of genus at least 11 over kk, and let LL be a very ample line bundle. For a section sH0(C,L)s\in H^0(C,L), use the closed points pi(s)p_i(s) and geometric points pˉi(s)\bar p_i(s) of (s=0)(s=0) as above. Let APic(C)A\subsetneq\operatorname{Pic}^{\circ}(C) be an Abelian subvariety and let ΓPic(C)\Gamma\subset\operatorname{Pic}(C) be a finitely generated subgroup containing [L][L].

Strengthened independence conjecture. For “most” sections, the following maps are injections:

(iIZ[pi(s)])/iI[pi(s)]Pic(C)/A(k),Γ\left(\bigoplus_{i\in I}\mathbb Z[p_i(s)]\right)\Big/\sum_{i\in I}[p_i(s)]\hookrightarrow \operatorname{Pic}(C)\Big/\langle A(k),\Gamma\rangle

and

(iIˉZ[pˉi(s)])/iIˉ[pˉi(s)]Pic(Ckˉ)/A(kˉ),Γ.\left(\bigoplus_{i\in\bar I}\mathbb Z[\bar p_i(s)]\right)\Big/\sum_{i\in\bar I}[\bar p_i(s)]\hookrightarrow \operatorname{Pic}(C_{\bar k})\Big/\langle A(\bar k),\Gamma\rangle.

The first is the weak form and the second the strong form.

This is explicitly introduced as a stronger variant needed for the threefold case of the paper’s homeomorphism problem. Its status depends on the unresolved meaning of “most” and no proof is supplied.

Sources & referencesView supporting material

Primary source

János Kollár, “What determines a variety?”, arXiv:2002.12424 (2020).

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