POSITIVITY OF 2 x 2 BLOCK MATRICES OF OPERATORS

POSITIVITY OF 2 x 2 BLOCK MATRICES OF OPERATORS
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DOI:
10.1215/17358787-2019-0019
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发表时间:
2019-07-01
影响因子:
1.2
通讯作者:
Xu, Qingxiang
Xu, Qingxiang
中科院分区:
数学2区
文献类型:
--
作者:
Moslehian, Mohammad Sal;Kian, Mohsen;Xu, Qingxiang

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我们回顾了著名的道格拉斯定理关于因式分解、范围包含和运算符主要化等价性的一些重要概括和应用。然后我们应用它来找到希尔伯特空间上算子的 2 x 2 分块矩阵的正性特征。最后,我们描述了此类分块矩阵的性质,并提供了几种显示其积极性的方法。
We review some significant generalizations and applications of the celebrated Douglas theorem on equivalence of factorization, range inclusion, and majorization of operators. We then apply it to find a characterization of the positivity of 2 x 2 block matrices of operators on Hilbert spaces. Finally, we describe the nature of such block matrices and provide several ways for showing their positivity.