2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/170186We show that the Borel-equivariant derived category of sheaves on the flag variety of a complex reductive group is equivalent to the perfect derived category of dg modules over the extension algebra of the direct sum of the simple equivariant perverse sheaves. This proves a conjecture of Soergel and Lunts in the case of flag varieties.Representation Theory14M15, 18E30text