The existence and multiplicity results are obtained for a class of fourth-order nonlinear elliptic equations by the leastactionprinciple 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。
2
If the physics seems a bit arcane, consider that you probably spent much of the past two weeks seeing the angular-momentum principle in action — at least if you watched the Olympics.