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Hölder不等式 - Wikipedia

Hölder不等式

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赫爾德不等式數學分析的一條不等式,取名自奧圖·赫爾德(Otto Hölder)。這是一條揭示Lp空間的相互關係的基本不等式:

S為測度空間,1 \le p,q \le \infty,及{1\over p} + {1\over q} = 1,設fLp(S)內,gLq(S)內。則f gL1(S)內,且有

\|fg\|_1 \le \|f\|_p \|g\|_q

S取作{1,...,n}附計數測度,便得赫爾德不等式的特殊情形:對所有實數(或複數x1, ..., xn; y1, ..., yn,有

\sum_{k=1}^n |x_k y_k| \leq \left( \sum_{k=1}^n |x_k|^p \right)^{1/p} \left( \sum_{k=1}^n |y_k|^q \right)^{1/q}

若取S自然數集附計數測度,便得與上類似的無窮級數不等式。

p = q = 2,便得到柯西-施瓦茨不等式

赫爾德不等式可以證明Lp空間上一般化的三角不等式閔可夫斯基不等式,和證明Lp空間是Lq空間的對偶

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