2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/69455The homotopy category of complexes of projective left-modules over any reasonably nice ring is proved to be a compactly generated triangulated category, and a duality is given between its subcategory of compact objects and the finite derived category of right-modules.10 pagesRings and AlgebrasCategory Theory18E30, 16D40text