证明:A function is convex if and only if it is convex when restricted to any line...

Boyd Convex Optimization的第3章开头给出了凸函数的定义和一种判别方法,但没有证明过程,在此给出证明。 原文这样说的:A function is convex if and only if it is convex when restricted to any line that intersects its domain.这句话看不懂,其实后面还有 in other wor
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