All graphs are finite simple undirected graph with no isolated vertices in this paper. It is completed the classification of graphs on which a semidihedral group acts edge-transitively.

运用图的自同构理论，获得了关于半二面体群边传递的图Γ的完全类。

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射的定义: 反射是欧几里得空间的对合等距同构，它的不动点集合是余维度为 1 的仿射子空间。