为了求解这两个微分差分方程，给出一个系统的代数算法。
In order to solve the two differential-difference equations, a systematic algebraic algorithm is given.
这些系统能够用定常差分方程，有时甚至能用代数方程来描述。
They are described by ordinary difference equations, or in some cases by purely algebraic equations.
差分方程形成的代数方程组用线松弛迭代求解。
The algebraical equations obtained from the difference equations are solved by the line relaxation iterative method.
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