Then we discuss billiard trajectories in polyhedral angles, since it is well known that any hard ball system on a line is isomorphic to a billiard in an appropriate polyhedral angle.

 
  • 然后我们讨论多面角里的台球轨迹,因为熟知直线上的硬球系统同构于适当的多面角里的台球系统。
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