Chi-Kwong Li

collaborators

4 papers

math.FA2025

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.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 $w_{k} (A + μ B) = w_{k} (A) + w_{k} (B)$ for som…

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…

math.CO2024

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…

Linear maps preserving product of involutions

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

Linear maps on matrices preserving parallel pairs

Confluent Vandermonde matrix and related topics

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