It is meaningful to study solutions to closed boundary value problems for equations of mixed type, which is closely related to physical phenomena.
混合型方程的封闭边界值问题的解的研究是很有意义的，它与物理现象紧密联系在一起。
The elastic equilibrium is reduced to solve some Rimann boundary value problem and the solution in closed form is given.
所求问题归结为求解复应力函数的边值问题，并给出了封闭形式的解。
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