In the mathematical theory of knots, a knot is tame if it can be "thickened", that is, if there exists an extension to an embedding of the solid torus S 1 × D 2 {\displaystyle S^{1}\times D^{2}} into the 3-sphere. A knot is tame if and only if it can be represented as a finite closed polygonal chain.
In the mathematical theory of knots, a knot is tame if it can be "thickened", that is, if there exists an extension to an embedding of the solid torus S 1 × D 2 {\displaystyle S^{1}\times D^{2}} into the 3-sphere. A knot is tame if and only if it can be represented as a finite closed polygonal chain.
Source: Wikipedia "Wild knot" · CC BY-SA 4.0
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