判别一类不变凸函数的充分条件
A Sufficient Condition for Invex Functions
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摘要: 利用微分几何的分析工具,给出了判别一类不变凸函数的充分条件.如果一个可微函数在г-凸集上的г-Hf矩阵是(正定)半正定的,则函数是(严格)不变凸函数.特别地,若函数没有临界点,则函数是局部严格不变凸的.Abstract: With the help of differential geometrical tools,a sufficient condition is given to determine the invexity of differentiable functions.A differentiable function is(strictly)invex function if its г-Hf is positive(definite)semidefinite in a г-convex set.Particularly,a function with no critical points is a locally strictly invex function.
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