1.These observations allow one to formalize the definition of reflection: a reflection is an involutive isometry of an Euclidean space whose set of fixed points is an affine subspace of codimension 1.
1.这察允许我们形式化反射的定义: 反射
欧
里得空间的对
等距同构,它的不动点集
维度为 1 的仿射子空间。