RT journal article T1 C∞-symmetries of distributions and integrability A1 Pan Collantes, Antonio Jesús A1 Ruiz Serván, Adrián A1 Muriel Patino, María Concepción A1 Romero, J. L. A2 Matemáticas K1 C∞-structure K1 C∞-symmetry of a distribution K1 Differential equations K1 Frobenius integrability K1 Solvable structure K1 Symmetry of a distribution AB An extension of the notion of solvable structure for involutive distributions of vector fields is introduced. It is based on a generalization of the concept of symmetry of a distribution of vector fields, inspired in the extension of Lie point symmetries to C∞-symmetries for ODEs developed in the recent years. The new structures, named C∞-structures, play a fundamental role in the integrability of the distribution: the knowledge of a C∞-structure for a corank k involutive distribution allows to find its integral manifolds by solving k successive completely integrable Pfaffian equations. These results have important consequences for the integrability of differential equations. In particular, we derive a new procedure to integrate an mth-order ordinary differential equation by splitting the problem into m completely integrable Pfaffian equations. This step-by-step integration procedure is applied to fully integrate several equations that cannot be solved by standard procedures. PB Elsevier SN 0022-0396 YR 2022 FD 2022-12-07 LK http://hdl.handle.net/10498/31835 UL http://hdl.handle.net/10498/31835 LA eng DS Repositorio Institucional de la Universidad de Cádiz RD 10-may-2026