Then the new step function space is introduced and stability problem for the finite difference scheme is discussed by means of variational approximation method.

然后引入新的步长函数空间，并在这个空间上，采用变分近似法讨论该格式的稳定性问题。

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Then the new function space is introduced and the stability problem for the finite difference scheme is discussed by means of variational approximation method in this function space.

然后引入新的函数空间，并在这个空间上，采用变分近似法讨论了该格式的稳定性问题。

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The TM set of equations can be solved using a finite difference time domain (FDTD) approximation that is second-order accurate in both space and time.

采用时间和空间均为二阶精确的有限差分方法，将偏微分方程进行差分化。 这样，空间的电磁场可由时间域有限差分法（FDTD）来求解。

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