Nung-Sing Sze

activity

20072026

most citedCanonical forms, higher rank numerical range, convexity, totally isotropic subspace, matrix equations

84 citations · 379 across the 37 of their papers we have counts for

collaborators

Showing 2015Show all

2 papers · 1 filter

math.FA2015★ 10 cited

Linear rank preservers of tensor products of rank one matrices

Zejun Huang, Shiyu Shi, Nung-Sing Sze

Let $n_{1}, \dots, n_{k}$ be integers larger than or equal to 2. We characterize linear maps $ϕ : M_{n_{1} \dots n_{k}} \to M_{n_{1} \dots n_{k}}$ such that $${\mathrm rank}\,(ϕ(A_1\otim…

math.FA2015★ 3 cited

Product of positive semi-definite matrices

Jianlian Cui, Chi-Kwong Li, Nung-Sing Sze

It is known that every complex square matrix with nonnegative determinant is the product of positive semi-definite matrices. There are characterizations of matrices that require tw…