2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/226221We study stable rank 2 vector bundles with trivial determinant whose Frobenius pull back is non stable over a general curve of genus g>1. In genus 2, we apply recent results about the theta divisor associated to the bundle B of locally exact differential forms and we derive a scheme-theoretic description of the Frobenius inverse image of the semi-stable boundary of the moduli space.25 pagesAlgebraic Geometry14H60 (Primary), 14H40 (Secondary)text