Year: 2026
Type: preprint
Abstract: Rencently, Fang, Hou, Jiang, and Zhang reduced Halmos's third problem to invertible operators with conjugate bi-geometric form. An operator has such a form if, with respect to an orthogonal decomposition, it admits a representation $$ T = \begin{pmatrix} A & C \\ 0 & B \end{pmatrix}, \quad A^*, B \in B_1(O_δ),$$ where $O_δ=\{z\in\mathbb C:|z|<δ\}$ for some $δ>0$, and $B_1(O_δ)$ denotes the rank-one Cowen--Douglas class. We restrict our attention to the case $B=A^*$ with strictly positive coupling $C$, and settle Halmos's third problem for this class of operators. More precisely,we prove that every such operator $T$ is invertible and that $T^{-1}$ has a nontrivial closed invariant subspace. This result contributes to the study of Halmos's third problem within the conjugate bi-geometric framework.The proof combines monotone solutions of operator Riccati equations with strong operator convergence to construct invariant subspaces for associated Hamiltonian operator matrices.
Source: arXiv (Cornell University)
Authors: Kui Ji, Zhenyue Wang
Language: English
Subfield: Applied Mathematics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7224123256