Junjie Wang

collaborators

2 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 TurÃ¡n numbers of triangles

Junjie Wang, Yaoping Hou

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