Euclidean space

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的定义: 是欧几里得空的对等距同构，它的不动是余维度为 1 的仿子空。