2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/68750In this short note, we show that any rational curve passing through the generic point in a moduli space of stable bundles with rank $r$ and fixed determinant on a smooth projective curve of genus $g\ge 4$ has degree (with respect to the anti-canonical line bundle of the moduli space) at least $2r$. It has degree $2r$ if and only if it is a Hecke curve.6 pages, amstexAlgebraic Geometry14F10, 14F05text