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.这些观察允许我们形式化反的定义: 反
欧
间的对合等距同构,它的不动点集合
余维度为 1 的仿
子
间。