The existence and multiplicity results are obtained for a class of fourth-order nonlinear elliptic equations by the least action principle and the minimax methods, respectively.
通过极小化作用原理和极小极大方法得到了一类四阶非线性椭圆方程解的存在性和多重性。
In this thesis, several nonconforming finite element methods for plate problems and fourth order elliptic singular perturbation problems are discussed.
在论文中，我们主要讨论了四阶椭圆问题的一些非协调有限元逼近。
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