2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52656We investigate some aspects of Pi-stability of D-branes on Calabi-Yau threefolds in cases where there is a point in moduli space where the grades nearly or completely align. We prove that an example of complete alignment is the case of a collapsed del Pezzo surface. It is shown that there is an open neighbourhood of such a point for which Pi-stability reduces to theta-stability of quiver representations. This should be contrasted to the case of the large radius limit where mu-stability of sheaves cannot be extended out over an open neighbourhood.16 pages, LaTeX, lecture given at "String Geometry", Snowbird 2004High Energy Physics - Theorytext