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证明两点的Jensen不等式: f(tx_1 + (1-t)x_2) <= tf(x_1) + (1-t)f(x_2) —— 直接从凸性定义。
证明两点的Jensen不等式: f(tx_1 + (1-t)x_2) <= tf(x_1) + (1-t)f(x_2) —— 直接从凸性定义。
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