The fully relatively quasi-convex virtual-retract conjecture

Let NN be an orientable, compact, non-positively curved 33-manifold with empty or toroidal boundary, and write π=π1(N)\pi=\pi_1(N). Equip π\pi with its natural relatively hyperbolic structure. A subgroup is fully relatively quasi-convex when it is relatively quasi-convex and has, for each peripheral subgroup, either trivial intersection or finite-index intersection. Fully relatively quasi-convex virtual-retract conjecture. If Γπ\Gamma\leq\pi is fully relatively quasi-convex, then Γ\Gamma is a virtual retract of π\pi; in particular, Γ\Gamma is separable. The source presents this as a proposed class of separable subgroups and gives no resolution status.

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Primary source

Matthias Aschenbrenner, Stefan Friedl and Henry Wilton, “3-manifold groups”, arXiv:1205.0202 (2013).

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