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.
这些观察允许我们形式化的定义:
欧几里得空
的对合等距
,
的不动点集合
余维度为 1 的仿
子空
。