Abstract
Let $T$ be an adjointable operator between two Hilbert $C^*$-modules, and let $T^*$ be the adjoint operator of $T$. The polar decomposition of $T$ is characterized as $T=U(T^*T)^\frac{1}{2}$ and $\mathcal{R}(U^*)=\overline{\mathcal{R}(T^*)}$, where $U$ is a partial isometry, $\mathcal{R}(U^*)$ and $\overline{\mathcal{R}(T^*)}$ denote the range of $U^*$ and the norm closure of the range of $T^*$, respectively. Based on this new characterization of the polar decomposition, an application to the study of centered operators is carried out.
Citation
Na Liu. Wei Luo. Qingxiang Xu. "The polar decomposition for adjointable operators on Hilbert $C^*$-modules and centered operators." Adv. Oper. Theory 3 (4) 855 - 867, Autumn 2018. https://doi.org/10.15352/aot.1807-1393
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