In addition, we review literature related to converging shock waves caused by spherical piston motions and the corresponding series solutions of the piston motion for polytropic gas.

• 此外，我们也藉由回顾两篇文献，探讨由球面活塞运动所造成的会聚震波问题，与活塞在静止气体中运动所产生的震波级数解问题。