2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/64402Let G be a connected reductive group. The late Ramanathan gave a notion of (semi)stable principal G-bundle on a complex projective curve and constructed a projective moduli space of such objects. We generalize Ramanathan's notion and construction to the case of higher dimension, allowing also objects which we call semistable principal G-sheaves.48 pages, LaTex2e (Improved exposition)Algebraic Geometry14D22; 14D20text