2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/72824These notes are the written version of my lectures at the Banach Center mini-school "Schubert Varieties" in Warsaw, May 18-22, 2003. Their aim is to give a self-contained exposition of some geometric aspects of Schubert calculus.LaTeX, 59 pagesAlgebraic Geometry14M15; 14N15 (14L30; 19A99; 57T15)text