2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/76449We calculate a generating series for the virtual Euler-Poincaré characteristics of the spaces of stable maps of genus zero to flag spaces using the summation over trees technique.12 pages, AMSTex. Several annoying misprints and errors in formulas are correctedAlgebraic GeometryQuantum Algebratext