Weijun Liu

activity

20192022

most citedSome applications of two completely copositive maps

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

collaborators

7 papers

math.CO2022

Spectral radius and the $2$ -power of Hamilton cycles

Xinru Yan, Xiaocong He, Lihua Feng +1

Let $G$ be a graph of order $n$ and spectral radius be the largest eigenvalue of its adjacency matrix, denoted by $μ (G)$ . In this paper, we determine the unique graph with maximum…

math.CO2021

The Q-index and connectivity of graphs

Peng-Li Zhang, Lihua Feng, Weijun Liu +1

A connected graph $G$ is said to be $k$ -connected if it has more than $k$ vertices and remains connected whenever fewer than $k$ vertices are deleted. In this paper, for a connecte…

math.CO2021★ 1 cited

A tight $Q$ -index condition for a graph to be $k$ -path-coverable involving minimum degree

Tao Cheng, Lihua Feng, Yongtao Li +1

A graph $G$ is $k$ -path-coverable if its vertex set $V (G)$ can be covered by $k$ or fewer vertex disjoint paths. In this paper, using the $Q$ -index of a connected graph $G$ , we pre…

math.RA2020

Extensions of Fiedler-Markham's inequality and Thompson's inequality

Yongtao Li, Yang Huang, Lihua Feng +1

We present some new inequalities related to determinant and trace for positive semidefinite block matrices by using symmetric tensor product, which are extensions of Fiedler-Markha…

math.FA2020

Another determinantal inequality involving partial traces

Yongtao Li, Lihua Feng, Weijun Liu +1

Let $A$ be a positive semidefinite $m \times m$ block matrix with each block $n$ -square, then the following determinantal inequality for partial traces holds \[ (\mathrm{tr} A)^{mn}…

math.FA2020★ 2 cited

Some applications of two completely copositive maps