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Title:
NonLERFness of groups of certain mixed 3-manifolds and arithmetic hyperbolic $n$-manifolds
Speaker:
Abstract:
I will show that the groups of mixed 3-manifolds containing arithmetic hyperbolic pieces and the groups of certain noncompact arithmetic hyperbolic $n$-manifolds ($n > 3$) are not LERF. The main ingredient is a study of the set of virtual fibered boundary slopes for cusped hyperbolic 3-manifolds, and some specialty of Bianchi manifolds.
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