Qingxiang Xu

collaborators

2 papers

math.FA2026

Norm attainment of a class of block operator matrices

Kangjian Wu, Jiayu Ling, Qingxiang Xu

Given complex numbers $a, b, c$ and a non-negative continuous function $I ¨ $ defined on $[0, + \infty)$ , consider the $2 \times 2$ matrix $$ M_t = \begin{pmatrix} a & t \\ ct & bÏ(t…

math.OA2025

The matched projections of idempotents on Hilbert $C^{*}$ -modules

Xiaoyi Tian, Qingxiang Xu, Chunhong Fu

The aim of this paper is to give new characterizations of some fundamental issues about idempotents. In the general setting of adjointable operators on Hilbert $C^{*}$ -modules, a new…

Norm attainment of a class of block operator matrices

The matched projections of idempotents on Hilbert C∗-modules

The matched projections of idempotents on Hilbert $C^{*}$ -modules