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edited title

edited Jun 21, 2021 at 21:37

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Invertible 2-knots in $S^4$

Is it true that a knot $S^2\hookrightarrow S^4$ has an inverse iff it is trivial? Or it is also an open question?

See relatedly Unknotted $S^{n-2}$ in $S^n$.

gt.geometric-topology differential-topology 4-manifolds

asked Jun 21, 2021 at 17:53

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