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证明 f 凸当且仅当图像始终在任何切线上方: f(y) >= f(x) + f'(x)(y-x) 对所有。
证明 f 凸当且仅当图像始终在任何切线上方: f(y) >= f(x) + f'(x)(y-x) 对所有。
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