然后根据这个估计式，将问题化成求解一个条件变分问题。

Using this estimate, it may be simplified to solve a problem of the conditional variation.

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文中引入了一类广义不变凸函数，对一类变分问题给出了最优解的充分性条件以及对偶理论。

The generalized invex functions are introduced and the optimality theorems and duality theory are established for a class of variational problems.

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提出了一个包括界面条件及间断面条件在内的混合边值问题的广义变分原理，建立了极限载荷乘子的变分解析公式。

A generalized variational principle involving conditions of the rigid-plastic interface and the discontinuous surface of a velocity field has been put forward for the mixed-boundary value problem.

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