Figure-eight knot (mathematics)

Figure-eight knot of practical knot-tying, with ends joined

$Simple squared depiction of figure-eight configuration.$

Symmetric depiction generated by parametric equations.

In knot theory, a figure-eight knot (also called Listing's knot) is the unique knot with a crossing number of four. This is the smallest possible crossing number except for the unknot and trefoil knot. The figure-eight knot is a prime knot.

单词	Listing knot
释义	Listing knot 英语百科 Figure-eight knot (mathematics) $Simple squared depiction of figure-eight configuration.$ In knot theory, a figure-eight knot (also called Listing's knot) is the unique knot with a crossing number of four. This is the smallest possible crossing number except for the unknot and trefoil knot. The figure-eight knot is a prime knot.
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Listing knot

Figure-eight knot (mathematics)