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

Boyd Convex Optimization的第3章開頭給出了凸函數的定義和一種判別方法,但沒有證明過程,在此給出證明。 原文這樣說的:A function is convex if and only if it is convex when restricted to any line that intersects its domain.這句話看不懂,其實後面還有 in other wor
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