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的定义:
是欧
里得空间的对合
构,它的不动点集合是余维度为 1 的仿
子空间。