2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/75003Geometrical properties of holonomic and non holonomic varieties defined by the Pfaff equations connected with a first order systems of differential equations are studied. The Riemann extensions of affine connected spaces for investigation of geodesics and asymptotic lines are used.13 pages, LaTeXDifferential GeometryDynamical Systems53 xxtext