Qingxiang Xu

most citedRoom-temperature nonlinear transport and microwave rectification in antiferromagnetic MnBi

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7 citations · 7 across the 3 of their papers we have counts for

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3 papers · 1 filter

math.FA2025

A simplified formula for the matched projection of an idempotent

Qingxiang Xu

Let $L (H)$ be the set of all adjointable operators on a Hilbert $C^{*}$ -module $H$ . For each $T \in L (H)$ , $T^{*}$ denotes its adjoint operator, and $∣ T^{*} ∣$ is the po…

math.FA2025

The numerical ranges of the generalized quadratic operators

Kangjian Wu, Qingxiang Xu

We investigate the generalized quadratic operator defined by $T = (a I_{H} c A^{*} A b I_{K}),$ where $H$ and $K$ are Hilbert spaces, $…

math.FA2025

Convex inequalities in Hilbert $C^{*}$ -modules

Kangjian Wu, Jia Li, Qingxiang Xu

The H $o ¨$ lder-McCarty inequalities are originally derived in the Hilbert space case and have been generalized via a convex inequality. The main purpose of this paper is t…

A simplified formula for the matched projection of an idempotent

The numerical ranges of the generalized quadratic operators

Convex inequalities in Hilbert C∗-modules

Convex inequalities in Hilbert $C^{*}$ -modules