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A three-manifold is a space that locally looks like Euclidean three-dimensional space

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3 answers
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Thurston's 24 questions: All settled?

Thurston's 1982 article on three-dimensional manifolds1 ends with $24$ "open questions":       $\cdots$ Two naive questions from an outsider: (1) Have all $24$ now been resolved? (2) If so, w …
Joseph O'Rourke's user avatar