Alexandru Ghitza

collaborators

2 papers

math.NT2026

The solvability of the inverse volcano problem over non-prime finite fields

Alexandru Ghitza, Dhruv Gupta, Maximilian Kortge

For a finite field $F_{p^{k}}$ and a prime $ℓ \neq = p$ , consider the graph $G$ of $ℓ$ -isogenies between ordinary elliptic curves over $F_{p^{k}}$ . Kohel proved t…

math.NT2025

The non-existence of some Galois representations of moderate dimension in small characteristic

Alexandru Ghitza, Takuya Yamauchi

Refining arguments of Hyunsuk Moon, under the assumption of the Generalized Riemann Hypothesis, we prove the non-existence of irreducible mod 2 Galois representations unramified ou…