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The engulfing property for 3-manifolds

Graham A. Niblo, Daniel T. Wise

math.GTarXiv:math/9810198

Abstract

We show that there are Haken 3-manifolds whose fundamental groups do not satisfy the engulfing property. In particular one can construct a pi1-injective immersion of a surface into a graph manifold which does not factor through any proper finite cover of the 3-manifold.

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