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单词 Holder inequality
释义

Holder inequality

中文百科

赫尔德不等式 Hölder's inequality

(重定向自Holder inequality)

赫尔德不等式是数学分析的一条不等式,取名自奥托·赫尔德(Otto Hölder)。这是一条揭示L空间的相互关系的基本不等式:

S为测度空间,1 \le p,q \le \infty,及{1\over p} + {1\over q} = 1,设fL^p(S)内,gL^q(S)内。则f\mbox{ }gL^1(S)内,且有

S取作\{1,...,n\}附计数测度,便得赫尔德不等式的特殊情形:对所有实数(或复数)x_1,\mbox{ }...,\mbox{ }x_n;\mbox{ }y_1,\mbox{ }...,\mbox{ }y_n,有

我们称pq互为赫尔德共轭

若取S为自然数集附计数测度,便得与上类似的无穷级数不等式。

p = q = 2,便得到柯西-施瓦茨不等式。

赫尔德不等式可以证明L^p空间上一般化的三角不等式,闵可夫斯基不等式,和证明L^p空间是L^q空间的对偶。

英语百科

Hölder's inequality 赫尔德不等式

(重定向自Holder inequality)

In mathematical analysis Hölder's inequality, named after Otto Hölder, is a fundamental inequality between integrals and an indispensable tool for the study of L spaces.

The numbers p and q above are said to be Hölder conjugates of each other. The special case p = q = 2 gives a form of the Cauchy–Schwarz inequality. Hölder's inequality holds even if ||fg||1 is infinite, the right-hand side also being infinite in that case. Conversely, if f is in L(μ) and g is in L(μ), then the pointwise product fg is in L(μ).

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更新时间:2025/6/17 2:40:53