Fristly the boundary value problems for the equations is formulated, and then by using the compactness principle, the existence of solutions for the above problems is proved.
先给出这些问题的提法，然后使用列紧性原理和极值原理证明了上述二阶椭圆型方程边值解的存在性和唯一性。
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。
These results can be applied to study the existence of the radial solutions for the elliptic boundary value problems.
这些结果能被用来研究椭圆边值问题径向对称解的存在性。
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