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arXiv 2103.15699math.FA
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有界线性算子对的Lebesgue型分解和Radon-Nikodym导数

Lebesgue type decompositions and Radon-Nikodym derivatives for pairs of bounded linear operators

Seppo Hassi, Henk de Snoo

摘要:

对于一对有界线性希尔伯特空间算子$A$和$B$,我们考虑$B$关于$A$的Lebesgue型分解为几乎支配部分和奇异部分,类似于测度对的Lebesgue分解(在这种情况下,我们说的是绝对连续部分和奇异部分)。一个完整的参数化的所有Lebesgue型分解,并将这种分解的唯一性的特点。此外,它将被证明,几乎占主导地位的部分$B$在Lebesgue型分解有一个抽象的Radon-Nikodym导数的运营商$A$。

英文摘要:

For a pair of bounded linear Hilbert space operators $A$ and $B$ one considers the Lebesgue type decompositions of $B$ with respect to $A$ into an almost dominated part and a singular part, analogous to the Lebesgue decomposition for a pair of measures (in which case one speaks of an absolutely continuous and a singular part). A complete parametrization of all Lebesgue type decompositions will be given, and the uniqueness of such decompositions will be characterized. In addition, it will be shown that the almost dominated part of $B$ in a Lebesgue type decomposition has an abstract Radon-Nikodym derivative with respect to the operator $A$.

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