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Relatively hyperbolic group
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Relatively hyperbolic group : ウィキペディア英語版
Relatively hyperbolic group
In mathematics, the concept of a relatively hyperbolic group is an important generalization of the geometric group theory concept of a hyperbolic group. The motivating examples of relatively hyperbolic groups are the fundamental groups of complete noncompact hyperbolic manifolds of finite volume.
== Intuitive definition ==

A group ''G'' is relatively hyperbolic with respect to a subgroup ''H'' if, after contracting the Cayley graph of ''G'' along ''H''-cosets, the resulting graph equipped with the usual graph metric becomes a δ-hyperbolic space and, moreover, it satisfies a technical condition which implies that quasi-geodesics with common endpoints travel through approximately the same collection of cosets and enter and exit these cosets in approximately the same place.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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