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Results tagged with 3-manifolds
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user 5001
A three-manifold is a space that locally looks like Euclidean three-dimensional space
8
votes
Complexity of surfaces bounding knots in 4-ball and 3-sphere respectively
This is an answer to the first question.
Let's indicate with $r(K)$ the ribbon number of a knot, i.e.the minimum
number of ribbon singularities needed to realize a ribbon disc spanning $K$.
We have
$ …
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