one-wave equation

This is what we now call the equation of continuity, one of the relationships necessary for the derivation of the wave equation.

这就是我们现在所说的连续性方程，推导波动方程的必要条件之一。

In this paper, the symmetries and Lie algebra of a coupled nonlinear wave equation were discussed. One-parameter transformation groups of this equation were obtained by using the symmetries.

主要考虑非线性波方程组的一些简单对称及其构成的李代数，并利用所得对称给出该方程组的一些单参数变换群。

Alternatively, one may utilize the wave equation and appropriate boundary conditions to yield a specific solution.

另外，我们也可以利用波动方程和适当的边界条件以得出一个特解。