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arXiv math/0010010math.CAmath.FA
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Lorentz空间理论与加权不等式的新进展

Recent Developments in the Theory of Lorentz Spaces and Weighted Inequalities

Maria J. Carro, Jose A. Raposo, Javier Soria

摘要:

这项工作的主要目标是汇集两个众所周知的,先验的,无关的理论处理加权不等式的Hardy-Littlewood极大算子$M$,因此,我们认为有界的$M$加权洛伦兹空间$Λ^p_u(w)$。两个例子是历史上相关的动机:如果$w=1$,这对应于研究的有界性$M:L^p(u)\longrightarrow L^p(u),$的特点是由B。Muckenhoupt,从而产生所谓的$A_p$权重。第二种情况是我们使用$u=1$。这是一个较新的理论,并完全解决了M. A。Ariño和B. 1991年的Muckenhoupt。证明了$M:\llo\longrightarrow\llo,$的有界性等价于Hardy算子$A$对$L^p(w)$的减函数的有界性.满足这种有界性的权重类称为$B_p$。尽管$A_p$和$B_p$类具有一些相似的特征,但它们来自非常不同的理论,因此在每种情况下使用的技术也是如此:$A_p$的Calderón-Zygmund分解和覆盖引理,$B_p$的重排不变性质和正积分算子。我们的目标是给出这两个理论的统一版本。与人们所期望的相反,解决方案并不是根据上面考虑的限制情况给出的(即,$u=1$和$w=1$),但在一个相当复杂的条件下,这反映了估计Hardy-Littlewood极大算子关于一般测度的分布函数的困难.

英文摘要:

The main objective of this work is to bring together two well known and, a priori, unrelated theories dealing with weighted inequalities for the Hardy-Littlewood maximal operator $M$, and thus, we consider the boundedness of $M$ in the weighted Lorentz space $Λ^p_u(w)$. Two examples are historically relevant as a motivation: If $w=1$, this corresponds to the study of the boundedness $M:L^p(u)\longrightarrow L^p(u),$ which was characterized by B. Muckenhoupt, giving rise to the so called $A_p$ weights. The second case is when we take $u=1$. This is a more recent theory, and was completely solved by M.A. Ariño and B. Muckenhoupt in 1991. It turns out that the boundedness $M:\llo\longrightarrow\llo,$ can be seen to be equivalent to the boundedness of the Hardy operator $A$ restricted to decreasing functions of $L^p(w)$. The class of weights satisfying this boundedness is known as $B_p$. Even though the $A_p$ and $B_p$ classes enjoy some similar features, they come from very different theories, and so are the techniques used on each case: Calderón--Zygmund decompositions and covering lemmas for $A_p$, rearrangement invariant properties and positive integral operators for $B_p$. It is our aim to give a unified version of these two theories. Contrary to what one could expect, the solution is not given in terms of the limiting cases above considered (i.e., $u=1$ and $w=1$), but in a rather more complicated condition, which reflects the difficulty of estimating the distribution function of the Hardy-Littlewood maximal operator with respect to general measures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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