Ya-Shu Wang

most citedJoint numerical ranges and communtativity of matrices

1 citations · 1 across the 2 of their papers we have counts for

collaborators

2 papers

math.FA2020★ 1 cited

Joint numerical ranges and communtativity of matrices

Chi-Kwong Li, Yiu-Tung Poon, Ya-Shu Wang

The connection between the commutativity of a family of $n \times n$ matrices and the generalized joint numerical ranges is studied. For instance, it is shown that $F$ is a f…

math.RA2019

Nonsurjective maps between rectangular matrix spaces preserving disjointness, triple products, or norms

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

Let $M_{m, n}$ be the space of $m \times n$ real or complex rectangular matrices. Two matrices $A, B \in M_{m, n}$ are disjoint if $A^{*} B = 0_{n}$ and $A B^{*} = 0_{m}$ . In this paper, a char…