鞍函数
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saddle function 鞍式函数
convex closure of saddle function 鞍函数的凸闭包
concave closure of saddle function 鞍函数的凹闭包
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I should say that is for a function of two variables to try to decide whether a given critical point is a minimum, a maximum or a saddle point.
但这种办法并不普遍,只能用于二元函数,来判断是极小值点、极大值点还是鞍点。
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