Ngai-Ching Wong

collaborators

3 papers

math.FA2023

Weighted composition operators preserving various Lipschitz constants

Ching-Jou Liao, Chih-Neng Liu, Jung-Hui Liu +1

Let $Lip (X)$ , $Lip^{b} (X)$ , $Lip^{loc} (X)$ and $Lip^{pt} (X)$ be the vector spaces of Lipschitz, bounded Lipschitz, locally Lipschi…

math.FA2023

Linear maps preserving matrices annihilated by a fixed polynomial

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

Let $M_{n} (F)$ be the algebra of $n \times n$ matrices over an arbitrary field $F$ . We consider linear maps $Φ: {\bf M}_n(\mathbb{F}) \rightarrow {\bf M}_r(\ma…

math.RA2020

Nonsurjective zero product preservers between matrix spaces over an arbitrary field

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

A map $Φ$ between matrices is said to be zero product preserving if $Φ (A) Φ (B) = 0 whenever A B = 0.$ In this paper, we give concrete descriptions of an additiv…