On the interpolation constant for subadditive operators in Orlicz spaces

On the interpolation constant for subadditive operators in Orlicz spaces
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关于 Orlicz 空间中次加法算子的插值常数

DOI:
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发表时间:
2007
期刊:
影响因子:
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通讯作者:
L. Maligranda
L. Maligranda
中科院分区:
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文献类型:
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作者:
A. Karlovich;L. Maligranda

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设$1le p<qleinfty$,设$T$是作用于 $L^p$和$L^q$。我们证明了T$在Orlicz空间上有界 $L^phi$,其中$phi^{-1}(u)=u^{1/p} ho(u^{1/q-1/p})$对于某些凹函数$ $和[|不|_{L^phi 〇 L(Φ)= Cmax{|不|_{L^p o L^p},|不|_{L^q o L^q}}。一般来说,插值常数$C$小于4,在许多情况下,我们可以给出更好的估计。特别地,如果$p=1$和$q=infty$,则经典的Orlicz插值定理对插值常数C=1的次可加算子成立。这些结果推广了文献{KM 01}中关于线性算子的结果.
Let $1le p<qleinfty$ and let $T$ be a subadditive operator acting on $L^p$ and $L^q$. We prove that $T$ is bounded on the Orlicz space $L^phi$, where $phi^{-1}(u)=u^{1/p} ho(u^{1/q-1/p})$ for some concave function $ ho$ and [ |T|_{L^phi o L^phi}le Cmax{|T|_{L^p o L^p},|T|_{L^q o L^q}}. ] The interpolation constant $C$, in general, is less than 4 and, in many cases, we can give much better estimates for $C$. In particular, if $p=1$ and $q=infty$, then the classical Orlicz interpolation theorem holds for subadditive operators with the interpolation constant C=1. These results generalize our results for linear operators obtained in cite{KM01}.