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
定义: 反
是欧几里得
间
对合等距同构,它
不动点集合是余维度为 1 

子
间。

(几何学)
姻亲
;
称性


