Mathematical Physics: Classical Mechanics
《Mathematical Physics: Classical Mechanics》 · 第 38 页 · Chapter 4，完整 Definition 4.10（保留本书的两项附加条件）
A Conway sphere for a link \(L\) in \(S^3\) is a 2-sphere \(\Sigma\) in \(S^3\) that meets \(L\) transversely at four points such that (i) \(\Sigma-L\) is incompressible in \(S^3-L\) and (ii) any 2-sphere in \(S^3-\Sigma\) meeting \(L\) transversely at two points bounds a ball in \(S^3-\Sigma\) meeting \(L\) in just an unknotted arc.