Strengthened independence of intersection points conjecture

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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 s∈H0(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 A⊊Pic⁡∘(C)A\subsetneq\operatorname{Pic}^{\circ}(C) be an Abelian subvariety and let Γ⊂Pic⁡(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:

(⨁i∈IZ[pi(s)])/∑i∈I[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

(⨁i∈IˉZ[pˉi(s)])/∑i∈Iˉ[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.

References

Primary source

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

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