这是一个临界点，考察它的二阶导数,会发现这确实是一个极大值点。
That is a critical point. And we used the second derivative to see that this critical point is a local maximum.
运用临界点理论中的极小、极大方法得到一类超二次哈密顿系统的周期解的存在性的存在性定理。
Some solvability conditions of periodic solutions are obtained for a class of first order(superquadratic) non-autonomous Hamiltonian systems in light of the minimax methods of critical point theory.
通过使用临界点理论中的极大极小方法获得了两个新的存在性定理。
Two new existence theorems are obtained by the minimax methods in critical point theory.
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