Open Question: What is "4-dimensional space"?

12:26 Publicado por Anónimo

Home >All Categories > Science & Mathematics >Mathematics >Open QuestionVesuvia Vesuvia Member since:March 08, 2006Total points:3,318 (Level 4)I understand 3 but what is the 4th?Here is the context:
"In mathematics, the Poincaré conjecture ([pw?~ka?e],[1] English: /pw?n.k?'re?/ pwen-kar-REY) 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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