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Published online by Cambridge University Press: 27 August 2014
We prove that if
$\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}S$ is a properly embedded
$\pi _1$-injective surface in a compact 3-manifold
$M$, then
$\pi _1S$ is separable in
$\pi _1M$.