Dong Zhang

collaborators

4 papers

math.CO2025

Combinatorial Courant-Fischer-Weyl Minimax Principle on Cheeger $k$ -constants of Weighted Forests

Zijun Meng, Dong Zhang

We establish novel max-min and minimax characterizations of Cheeger $k$ -constants in weighted forests, thereby providing the first combinatorial analogue of the Courant-Fischer-Wey…

math.CO2025

Finite projective planes meet spectral gaps

Yuhan Guo, Dong Zhang

We show that for any connected graph $G$ with maximum degree $d \geq 3$ , the spectral gap from $0$ with respect to the adjacency matrix is at most $d - 1$ , with equality if and o…

hep-th2025

Notes on su $(1, 2) \oplus$ u $(1)$ Chern-Simons theory and Torsional Newton-Cartan gravity

Yang Lei, Dong Zhang

In this study, we investigate three-dimensional torsional Newton-Cartan (TNC) gravity by gauging the su $(1, 2) \oplus$ u $(1)$ algebra and construct its action using the Chern-Simons t…

math.CO2024

Equivalent spectral theory for fundamental graph cut problems

Sihong Shao, Chuan Yang, Dong Zhang +1

We introduce and develop equivalent spectral graph theory for several fundamental graph cut problems including maxcut, mincut, Cheeger cut, anti-Cheeger cut, dual Cheeger problem a…

Combinatorial Courant-Fischer-Weyl Minimax Principle on Cheeger k-constants of Weighted Forests

Finite projective planes meet spectral gaps

Notes on su(1,2)⊕u(1) Chern-Simons theory and Torsional Newton-Cartan gravity

Equivalent spectral theory for fundamental graph cut problems

Combinatorial Courant-Fischer-Weyl Minimax Principle on Cheeger $k$ -constants of Weighted Forests

Notes on su $(1, 2) \oplus$ u $(1)$ Chern-Simons theory and Torsional Newton-Cartan gravity