2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/152193The general framework of Legendre transformation is extended to the case of symplectic groupoids, using an appropriate generalization of the notion of generating function (of a Lagrangian submanifold).LaTeX, 11 pagesDifferential Geometry58F05 (Primary) 22A22, 58H05, 53Z05 (Secondary)text