用达朗贝尔公式求解二、三维波动方程的初值问题
Initial-value problems for two - and three-dimentional wave equations solved by d ′ Alembert formula
基于达朗贝尔公式，讨论了半无界弦自由振动时的非齐次边界条件的延拓问题。
Based on d'Alembert formula , the extension of inhomogeneous boundary condition on free vibration of semi-boundless string is discussed .
达朗贝尔公式