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ポアンカレ予想
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Wikipedia definition
1. Poincaré conjecture​In mathematics, the Poincaré conjecture is a theorem about the characterization of the three-dimensional sphere (3-sphere), which is the hypersphere that bounds the unit ball in four-dimensional space. The conjecture states: Every simply connected, closed 3-manifold is homeomorphic to the 3-sphere.
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