nLab
torus knot

Idea

A torus knot is one that can be drawn on the surface of a torus. Examples include the trefoil

and cinquefoil

knots.

Definition

A knot $K$ is said to be a torus knot if it can be embedded in the surface of a torus, that is, we have the map $K:S^1\to {ℝ}^3$ factors through the embedding of some torus $T_1\cong S^1\times S^1$ into ${ℝ}^2$;

$$S^1\stackrel{K}{\to }{T}_1\stackrel{\mathrm{embed}}{\to }{ℝ}^3$$S^1\stackrel{K}{\to}T_1\stackrel{embed}{\to} \mathbb{R}^3

category: knot theory