2 papers
math.RA2026
Singular Cholesky Fibers over Finite Fields
Hongfeng Wu, Kai Zhou
For a finite field $\F_q$, consider the triangular Cholesky map from upper triangular matrices to symmetric matrices. Generalized Cholesky theory describes the re…
math.CO2026
First Subconstituents of Orthogonal Graphs in Even Characteristic:Automorphisms, Cliques, Cores, and Binary Triple Transitivity
Kai Zhou, Hongfeng Wu
In even characteristic, the first subconstituent of an orthogonal graph at a singular point is shown to be the complement of an affine polar graph. This identification yields the f…