Projectivity conjecture for finitely generated pro-C\mathcal{C} subgroups

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Let GG be a torsion-free hyperbolic virtually compact special group, let G^\widehat{G} be its profinite completion, and let HH be a finitely generated pro-C\mathcal{C} subgroup of G^\widehat{G}, where C\mathcal{C} does not contain all finite groups.

Projectivity conjecture. HH is projective.

This proposes projectivity for finitely generated pro-C\mathcal{C} subgroups arising in profinite completions of torsion-free hyperbolic virtually compact special groups. The supplied text does not state whether the conjecture is known or remains open.

References

Primary source

Lucas C. Lopes and Pavel A. Zalesskii, “Pro-C groups acting on profinite trees”, arXiv:2607.23875 (2026).

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