Hung T. Dang

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math.NT2026

A structural trace identity and certified spectra for the Richelot-Brandt graph

Hung T. Dang

The degree- $2$ Brandt operator $B_{2} (2)$ on the principal genus of binary quaternion Hermitian lattices of discriminant $p$ is the weighted adjacency operator of the Richelot $(2,2)…

math.NT2026

Exact Stratification and Affine Mass Formulas for Split Richelot Data over Finite Fields

Hung T. Dang, Diep V. Nguyen

The Richelot $(2, 2)$ -step is the standard step of explicit genus-2 isogeny computation. We determine the exact stratification of its input space over a finite field $F_{q}$ …