As mathematicians say, “Every simply connected closed 3-manifold is homeomorphic to a 3-sphere.”
用数学语言表达就是“每个单连通3重(3-manifold)封闭体与一个三维球体同胚(homeomorphic)。”
As mathematicians say, "Every simply connected closed 3-manifold is homeomorphic to a 3-sphere."
用数学语言表达就是“每个单连通3重(3-manifold)封闭体与一个三维球体同胚(homeomorphic)。”
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