2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59802We describe a method of computing equivariant and ordinary intersection cohomology of certain varieties with actions of algebraic tori, in terms of structure of the zero- and one-dimensional orbits. The class of varieties to which our formula applies includes Schubert varieties in flag varieties and affine flag varieties. We also prove a monotonicity result on local intersection cohomology stalks.20 pages, 1 figureAlgebraic Geometry32S60 (Primary) 15M15, 58K70 (Secondary)text