The differential equation for the vibration of the riser system is derived by means of functional calculus of variation.
采用泛函变分法导出了隔水管的振动微分方程。
A new method to solve over-determined geodetic boundary value problem is proposed with the help of minimizing some kinds of functional in variation calculus.
本文借助于变分法中求泛函极小化的方法提出求解超定大地边值问题的新方法。
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