Euclidean space

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.

这些观察允许我们形式化反的定义: 反欧几里得空的对合等，它的不动点集合余维度为 1 的仿子空。