Mathematical Physics: Classical Mechanics
《Mathematical Physics: Classical Mechanics》 · 第 13 页 · Chapter 1，Definition 1.6（longitude 部分）
Let \(K\) be an oriented knot in (oriented) \(S^3\) with solid torus neighbourhood \(N\). […] A longitude \(\lambda\) of \(K\) is a simple closed curve in \(\partial N\) that is homologous to \(K\) in \(N\) and null-homologous in the exterior of \(K\).