doubly differentiable function
... doubly clad optical fibre ==> 双包层光学纤维 doubly differentiable function ==> 二阶可微函数 doubly excited state ==> 双重激发态 ...
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采用引进具有二阶连续可微的辅助函数，将非线性不等式组转化为非线性方程组，然后利用牛顿迭代法对非线性方程组进行求解。
In is established the equivalence between the nonlinear inequalities with nonlinear equations by using auxiliary function, a descended Newton algorithm is proposed.
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