Junjie Wang

collaborators

3 papers

math.CO2026

On a conjecture of Kolokolnikov on algebraic connectivity

Cheng Chi, Junjie Wang, Jiaxin Zheng

For a graph $G$ , let $α (G)$ be the second smallest eigenvalue of the Laplacian matrix of $G$ , also known as the algebraic connectivity. Algebraic connectivity plays an important ro…

math.CO2026

A lifting theorem for generalized Turán numbers of triangles

Junjie Wang, Yaoping Hou

For graphs $H$ and $F$ , the generalized Turán number $ex (n, H, F)$ denotes the maximum number of copies of $H$ in an $n$ -vertex $F$ -free graph. We prove a general lift…

math.CO2022

Spectral radius conditions for fractional $[a, b]$ -covered graphs

Junjie Wang, Jiaxin Zheng, Yonglei Chen

A graph $G$ is called fractional $[a, b]$ -covered if for every edge $e$ of $G$ there is a fractional $[a, b]$ -factor with the indicator function $h$ such that $h (e) = 1$ . In this paper…

On a conjecture of Kolokolnikov on algebraic connectivity

A lifting theorem for generalized Turán numbers of triangles

Spectral radius conditions for fractional [a,b]-covered graphs

Spectral radius conditions for fractional $[a, b]$ -covered graphs