Gitik, Rita ; Mitra, Mahan ; Rips, Eliyahu ; Sageev, Michah (1998) Widths of Subgroups Transactions of the American Mathematical Society, 350 . pp. 321329. ISSN 10886850

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Official URL: http://www.ams.org/journals/tran/199835001/S0002...
Abstract
We say that the width of an infinite subgroup H in G is n if there exists a collection of n essentially distinct conjugates of H such that the intersection of any two elements of the collection is infinite and n is maximal possible. We define the width of a finite subgroup to be 0. We prove that a quasiconvex subgroup of a negatively curved group has finite width. It follows that geometrically finite surfaces in closed hyperbolic 3manifolds satisfy the kplane property for some k.
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