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.
这些观察允形式化反射定义: 反射是欧里得空间对合等距同构,它点集合是余维度为 1 仿射子空间。
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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里得世界中欧里得何学家,他们发现在经验中看似平行直线经常相遇,斥责直线不保持直线——这对正在发生不幸碰撞唯一补救措施。