Zhongshan Li

activity

20122017

most citedMinimum ranks of sign patterns via sign vectors and duality

3 citations · 4 across the 7 of their papers we have counts for

collaborators

Showing 2017Show all

2 papers · 1 filter

math.CO2017

Sign patterns that require $H_{n}$ exist for each $n \geq 4$

Wei Gao, Zhongshan Li, Lihua Zhang

The refined inertia of a square real matrix $A$ is the ordered $4$ -tuple $(n_{+}, n_{-}, n_{z}, 2 n_{p})$ , where $n_{+}$ (resp., $n_{-}$ ) is the number of eigenvalues of $A$ with positive (resp…

math.CO2017

On the number of vertices of the stochastic tensor polytope

Zhongshan Li, Fuzhen Zhang, Xiao-Dong Zhang

This paper is devoted to the study of lower and upper bounds for the number of vertices of the polytope of $n \times n \times n$ stochastic tensors (i.e., triply stochastic arrays of…

Sign patterns that require Hn​ exist for each n≥4

On the number of vertices of the stochastic tensor polytope

Sign patterns that require $H_{n}$ exist for each $n \geq 4$