There exist arbitrarily many different disk knots with the same exterior

There exist arbitrarily many different disk knots with the same exterior
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by L. R. Hitt and D. W. Sumners PDF

Proc. Amer. Math. Soc. 86 (1982), 148-150 Request permission

We prove that, for $n \geqslant 5$, exteriors of disk knots of ${D^n}$ in ${D^{n + 2}}$ can be exteriors of arbitrarily many different disk knots.

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