2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/62664We use the Gromov-Witten invariants and a nonsqueezing theorem by the author to affirm a conjecture by P.Biran on the Lagrangian barriers.Latex, to appear in Proc. Amer. Math. SocSymplectic GeometryDifferential Geometry53CR15, 58F05, 58E05;57R57An extension of Biran's Lagrangian barrier theoremtext