2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59513Let G be a connected complex semi-simple group, B a Borel subgroup of G, and T a maximal torus in B. We construct a class of smooth T-stable subvarieties inside the flag variety G/B, each of which is an embedding of a product of projective lines.7 pages; needs LaTeX2e, AMS-LaTeX, and PSTricks (v2: section on orbit structure added)Algebraic GeometryDifferential GeometryRepresentation TheoryPrimary 14M15; Secondary 14L30, 22E46, 51M35text