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反射定义: 反射是欧几
空间
对合等
同构,它
动点集合是余维度为 1
仿射子空间。