Chi-Kwong Li

activity

20242026

collaborators

4 papers

math.FA2026

Linear maps preserving product of involutions

Chi-Kwong Li, Tejbir Lohan, Sushil Singla

An element of the algebra $M_{n} (F)$ of $n \times n$ matrices over a field $F$ is called an involution if its square equals the identity matrix. Gustafson, Halmos,…

math.CO2025

Confluent Vandermonde matrix and related topics

Chi-Kwong Li, Jephian C. -H. Lin

In this note, we explore the connections between the confluent Vandermonde matrix over an arbitrary field and several mathematical topics, including interpolation polynomials, Hass…

math.FA2024

Linear preservers of parallel matrix pairs with respect to the $k$ -numerical radius

Bojan Kuzma, Chi-Kwong Li, Edward Poon +1

Let $1 \leq k < n$ be integers. Two $n \times n$ matrices $A$ and $B$ form a parallel pair with respect to the $k$ -numerical radius $w_{k}$ if $w_{k} (A + I^¼ B) = w_{k} (A) + w_{k} (B)$ for so…

math.RA2024

Linear maps on matrices preserving parallel pairs

Chi-Kwong Li, Ming-Cheng Tsai, Ya-Shu Wang +1

Two (real or complex) $m \times n$ matrices $A$ and $B$ are said to be parallel (resp. triangle equality attaining, or TEA in short) with respect to the spectral norm $∥ \cdot ∥$ if…

Linear maps preserving product of involutions

Confluent Vandermonde matrix and related topics

Linear preservers of parallel matrix pairs with respect to the k-numerical radius

Linear maps on matrices preserving parallel pairs

Linear preservers of parallel matrix pairs with respect to the $k$ -numerical radius