2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/76627We prove that the number of connected components in the intersection of two open opposite Schubert cells in the variety of complete real n-dimensional flags equals 3*2^{n-1} for n>5.24 pages, 7 figures, AMSTeX, submitted to IMRNAlgebraic GeometryCombinatorics14M15 (Primary) 14N10, 14P25 (Secondary)text