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: 是欧里得空间的对合构,它的不动点集合是余维度为 1 的仿子空间。
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The classical theorists resemble Euclidean geometers in a non-Euclidean world who, discovering that in experience straight lines apparently parallel often meet, rebuke the lines for not keeping straight-as the only remedy for the unfortunate collisions which are occurring.
古典理论家类似于欧几里得世界中的欧几里得几何学家,他们发现在经验中看似平行的直线经常相遇,斥责直线不保持直线——这是对正在发生的不幸碰撞的唯一补救措施。