It is a difficult point to teach the students solving the wave equation on finiteinterval by the reflection law of the wave.
用波的反射原理求解有限区间上的波动方程是数学物理方程中的基本内容，也是教学中的难点内容。
2
In this paper, we present the computational methods of periodic orthogonal spline wavelets, which can be used to process the problems on the finiteinterval.
给出了周期正交样条小波的计算方法。用这种周期正交样条小波可方便地处理有限区间上的问题。
3
In both of these functions, if you want to wait for a finite time, you can specify the time interval in the second parameter.