Changxin Ding - Personal Website

About Me

Currently, I am a postdoc at Georgia Tech, supervised by Matt Baker. Before this, I completed my Ph.D. at Brandeis University under the supervision of Olivier Bernardi.

I am interested in the interplay of combinatorics, geometry, and algebra. My recent work focuses on

graph bijections related to spanning trees, Jacobian groups, orientations, etc.,
their generalizations to ribbon graphs,
and matroids and orthogonal matroid (a.k.a. even Δ-matroids) over tracts.

My CV.

Papers

The Jacobian of a regular orthogonal matroid and torsor structures on spanning quasi-trees of ribbon graphs
with Matt Baker and Donggyu Kim
preprint available on arxiv, 2025.
A consistent sandpile torsor algorithm for regular matroids
with Alex McDonough, Lilla Tóthmérész, and Chi Ho Yuen
European Journal of Combinatorics, 2025.
Csikvári's poset and Tutte polynomial
Discrete Mathematics, 2025.
The Jacobian of a sixth-root-of-unity matroid
with Matt Baker and Xu Zhuang
preprint available on arxiv, 2023.
A framework unifying some bijections for graphs and its connection to Lawrence polytopes
Combinatorial Theory, 2025.
Geometric bijections between spanning subgraphs and orientations of a graph
Journal of the London Mathematical Society, 2023.
The rotor-routing torsor and the Bernardi torsor disagree for every non-planar ribbon graph
Electronic Journal of Combinatorics, 2021.
The equality cases for the inequalities of Oppenheim and Schur for positive semi-definite matrices
with Xiaodong Zhang
Czechoslovak Mathematical Journal, 2009.