Mathematical Physics: Classical Mechanics
《Mathematical Physics: Classical Mechanics》 · 第 7 页 · Chapter 1，alternating knot 的定义
A glance at Table 1.1 shows that all the knots up to \(8_{18}\) have the property that in the displayed diagrams, the “over” or “under” nature of the crossings alternates as one travels along the knot. A knot is called alternating if it has such a diagram; alternating knots do seem to have particularly pleasant properties.