Figure Eight Knot -- from Wolfram MathWorld

The figure eight knot, also known as the Flemish knot and savoy knot, is the unique prime knot of four crossings 04-001. It has braid word sigma_1sigma_2^(-1)sigma_1sigma_2^(-1). The figure eight knot is implemented in the Wolfram Language as KnotData["FigureEight"]. It is a 2-embeddable knot, and is amphichiral as well as invertible. It has Arf invariant 1. It is not a slice knot (Rolfsen 1976, p. 224). The Alexander polynomial Delta(x), BLM/Ho polynomial Q(x), Conway

Figure Eight Knot -- from Wolfram MathWorld

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2: The complement of the figure-eight knot in S 3 can be realized with

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Thad Roberts on X: The hyperbolic figure eight knot, the shape of the simplest possible self-balanced manifold. / X

Knot -- from Wolfram MathWorld

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Figure-eight knot (mathematics) - Wikipedia

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