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In mathematics, more precisely in topology and differential geometry, a hyperbolic 3–manifold is a manifold of dimension 3 equipped with a hyperbolic metric, that is a Riemannian metric which has all its sectional curvatures equal to -1. It is generally required that this metric be also complete: in this case the manifold can be realised as a quotient of the 3-dimensional hyperbolic space by a discrete group of isometries (a Kleinian group).

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  • Hyperbolic 3-manifold (en)
  • 双曲3次元多様体 (ja)
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  • 数学において双曲3次元多様体(そうきょく3じげんたようたい、英: Hyperbolic 3-manifold)とは、定数断面曲率 -1 を持つ完備リーマン計量を備えるのことを言う。これは言い換えると、自由かつに作用する双曲等長の部分群による3次元の商である。を参照されたい。 この多様体の厚薄分解は、閉測地線の管状近傍からなる薄い部分と、ユークリッド曲面と閉半直線の積であるエンドからなる。この多様体の体積が有限であるための必要十分条件は、その厚い部分がコンパクトであることである。この場合、エンドは閉半直線を横切るトーラスの形をしており、尖点(cusp)と呼ばれる。 (ja)
  • In mathematics, more precisely in topology and differential geometry, a hyperbolic 3–manifold is a manifold of dimension 3 equipped with a hyperbolic metric, that is a Riemannian metric which has all its sectional curvatures equal to -1. It is generally required that this metric be also complete: in this case the manifold can be realised as a quotient of the 3-dimensional hyperbolic space by a discrete group of isometries (a Kleinian group). (en)
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