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。
The establishment of law results from multiplicity of culture, and curse, swear and pledge's failure to coordinate human relations between individuals and between individual and society.
法律的产生是文化多元的必然，也是诅誓（赌咒）、宣誓之类社会规范以及其他的社会规范无法有效调节人与人之间、人与社会之间关系的必然结果。
Some results on the existence and multiplicity of positive periodic solutions are derived.
利用重合度理论证明系统正周期解的存在性。
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