3 papers
math.AG2026
On the meagerness of the set of irregular bundles on Hopf surfaces
Edoardo Ballico, Elizabeth Gasparim
Let denote the moduli space of stable bundles with rank and second Chern class on a Hopf surface. We prove that the subset of formed…
math.AG2026
Finiteness of Hadamard ranks
Dario Antolini, Edoardo Ballico, Alessandro Oneto
The Hadamard rank of a point with respect to a projective variety is, if it exists, the minimum number of points of the variety whose coordinate-wise product is the given point. We…
math.AG2025
Postulation of schemes of length at most 4 on surfaces
E. Ballico, S. Canino
In this paper we address the postulation problem of zero-dimensional schemes on a surface of length at most 4. We prove some general results and then we focus on the case of P2, P1…