2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148768We derive some important geometric identities for Lagrangian submanifolds immersed in a Kähler manifold and prove that there exists a canonical way to deform a Lagrangian submanifold by a parabolic flow through a family of Lagrangian submanifolds if the ambient space is a Ricci-flat Calabi-Yau manifold.16 pages, AMS-TeX. This replacement contains only minor changes. Corollary 2.8 was wrong and has been removed. Proposition 2.9 has been renamed into Proposition 2.8 and we also added a new theorem (Theorem 2.9). In addition the format and some of the questions and remarks have been altered. The author apologizes for any inconvenienceDifferential Geometrytext