Cauchy-Schwarz inequality

柯西-施瓦茨不等式 对于实数或复数向量,有 $\left(\sum_{i=1}^n a_i b_i\right)^2 \leq \left(\sum_{i=1}^n a_i^2\right)\left(\sum_{i=1}^n b_i^2\right)$。

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