The puncturing conjectures for specialness and the weak Hilbert property

Let kk be a field, let XX be a smooth variety over kk, and let ZXZ\subset X be a closed subset of codimension at least two.

The puncturing conjectures. The following statements hold:

  1. If k=Ck=\mathbb{C} and XX is Brody-special, then XZX\setminus Z is Brody-special.
  2. If XX is geometrically-special over kk, then XZX\setminus Z is geometrically-special over kk.
  3. If XX is arithmetically-special over kk, then XZX\setminus Z is arithmetically-special over kk.
  4. If XX has the arithmetic weak Hilbert property over kk, then XZX\setminus Z has the arithmetic weak Hilbert property over kk.

The corresponding puncturing statement for smooth special varieties is proved in the paper, and the Kobayashi-special case follows from classical invariance of the Kobayashi pseudometric. The Brody-special, geometric-special, arithmetic-special, and arithmetic weak Hilbert property cases are presented as conjectural.

Sources & referencesView supporting material

Primary source

Finn Bartsch, Ariyan Javanpeykar and Aaron Levin, “Symmetric products and puncturing Campana-special varieties”, arXiv:2412.14931 (2025).

Additional references

2 papers in this index state this conjecture (2024). The statement above is taken from the most recent of them; the others are arXiv:2410.13403.

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