Stoll's conjecture on weak approximation with Brauer–Manin obstruction for curves

Let KK be a number field, let K\infty_K denote the set of archimedean places of KK, and let CC be a smooth, projective, geometrically connected curve over KK. Write C(AK)BrC(\mathbb{A}_K)^{\operatorname{Br}} for the Brauer–Manin set and prK\operatorname{pr}^{\infty_K} for the projection from adelic points to the adeles with the archimedean components removed.

Stoll's conjecture. The set C(K)C(K) is dense in

prK(C(AK)Br).\operatorname{pr}^{\infty_K}\bigl(C(\mathbb{A}_K)^{\operatorname{Br}}\bigr).

In particular, if C(K)C(K) is finite, then

C(K)=prK(C(AK)Br).C(K)=\operatorname{pr}^{\infty_K}\bigl(C(\mathbb{A}_K)^{\operatorname{Br}}\bigr).

This conjecture predicts weak approximation with Brauer–Manin obstruction off the archimedean places for every smooth, projective, geometrically connected curve over a number field. The source attributes it to Stoll and does not state that it has been resolved.

Sources & referencesView supporting material

Primary source

Han Wu, “Non-invariance of weak approximation with Brauer-Manin obstruction for surfaces”, arXiv:2209.00893 (2022).

Additional references

4 papers in this index state this conjecture (2018–2022). The statement above is taken from the most recent of them; the others are arXiv:2103.01784, arXiv:2010.04919, arXiv:1805.08851.

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