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arXiv 1409.3871math.FA
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Hardy型空间的K-闭性、BMO-正则性和实插值

On K-closedness, BMO-regularity and real interpolation of Hardy-type spaces

Dmitry V. Rutsky

摘要:

设$(X, Y)$是$\mathbb T \times Ω$上可测函数的拟Banach格对,$(X_A, Y_A)$是相应的Hardy型空间对.长期以来,人们一直怀疑$(X, Y)$的BMO-正则性不仅是$(X_A, Y_A)$在$(X, Y)$中的$\mathrm K$ -闭性的充分条件,而且是必要的.我们建立了这两个属性的等价性的一般夫妇的Banach格具有Fatou属性时,$Ω$是一个离散的可测空间,也为夫妇$(X, Y)$,其中$X$是准Banach,但$Y$被假定为$p$ -凸与一些$p > 1$(这里$Ω$是任意的)。在一定的限制条件下,证明了“好插值”公式$$ \left(X_A, \mathrm H_q\right)_{θ, p} = \left[\left(X, \mathrm L_q\right)_{θ, p}\right]_A $$成立的充要条件是$X$是BMO正则的.

英文摘要:

Let $(X, Y)$ be a suitable couple of quasi-Banach lattices of measurable functions on $\mathbb T \times Ω$, and let $(X_A, Y_A)$ be the couple of the corresponding Hardy-type spaces. It has long been suspected that the BMO-regularity property of $(X, Y)$ is not only sufficient for the $\mathrm K$-closedness of $(X_A, Y_A)$ in $(X, Y)$ but also necessary. We establish the equivalence of these two properties for a general couple of Banach lattices having the Fatou property when $Ω$ is a discrete measurable space, and also for couples $(X, Y)$ where $X$ is allowed to be quasi-Banach but $Y$ is assumed to be $p$-convex with some $p > 1$ (here $Ω$ is arbitrary). We show under certain mild restrictions that the "good interpolation" formula $$ \left(X_A, \mathrm H_q\right)_{θ, p} = \left[\left(X, \mathrm L_q\right)_{θ, p}\right]_A $$ holds true if and only if $X$ is BMO-regular.

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