... closed solid sphere 闭实心球 closed sphere 闭球 closed star 闭星形 ...
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closed solid sphere 闭实心球
closed unit sphere 闭单位球
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His conjecture, made in 1904, was that in this four-dimensional world, all closed three-dimensional surfaces that are simply connected could be transformed to look like a three-dimensional sphere.
ECONOMIST: Proof of the truth of the Poincar�� conjecture
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