Published online by Cambridge University Press: 02 June 2010
In this paper, we obtain several results on the commensurability of two Kleinian groups and their limit sets. We prove that two finitely generated subgroups G1 and G2 of an infinite co-volume Kleinian group G⊂Isom(H3) having Λ(G1)=Λ(G2) are commensurable. In particular, we prove that any finitely generated subgroup H of a Kleinian group G⊂Isom(H3) with Λ(H)=Λ(G) is of finite index if and only if H is not a virtually fibered subgroup.
The first author is supported by the China-funded Postgraduates Studying Aboard Program for Building Top University. The second author is supported by National Natural Science Foundation of China (No. 10671059) and Doctorate Foundation of the Ministry of Education of China (No. 20060532023).