Conservative Subgroup Separability For Surfaces With Boundary
arXiv:1204.4636 · doi:10.2140/agt.2013.13.115
Abstract
If F is a surface with boundary, then a finitely generated subgroup without peripheral elements of G = π_1(F) can be separated from finitely many other elements of G by a finite index subgroup of G corresponding to a finite cover F' with the same number of boundary components as F .