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Muckenhoupt weights : ウィキペディア英語版
Muckenhoupt weights
In mathematics, the class of Muckenhoupt weights consists of those weights for which the Hardy–Littlewood maximal operator is bounded on . Specifically, we consider functions on and their associated maximal functions defined as
: M(f)(x) = \sup_ \frac \int_ |f|,
where is the ball in with radius and centre . Let , we wish to characterise the functions for which we have a bound
: \int |M(f)(x)|^p \, \omega(x) dx \leq C \int |f|^p \, \omega(x)\, dx,
where depends only on and . This was first done by Benjamin Muckenhoupt.
==Definition==
For a fixed , we say that a weight belongs to if is locally integrable and there is a constant such that, for all balls in , we have
:\left(\frac \int_B \omega(x) \, dx \right)\left(\frac \int_B \omega(x)^} \, dx \right)^\frac \leq C < \infty,
where is the Lebesgue measure of , and is a real number such that: .
We say belongs to if there exists some such that
: \frac \int_B \omega(x) \, dx \leq C\omega(x),
for all and all balls .

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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