Chinea Trujillo, Francisco Javier2023-06-212023-06-2119840031-900710.1103/PhysRevLett.52.322https://hdl.handle.net/20.500.14352/64978©1984 The American Physical Society. The author wishes to thank Dr. F. Guil for numerous discussions. Partial financial support by Comisión Asesora de Investigación Científica y Técnica is gratefully acknowledged.The Einstein equations describing gravitational fields in vacuum are written as a compact exterior system of spinor-valued forms. A second system of equations is given, such that their integrability conditions are satisfied by virtue of the Einstein equations. This suggests the possibility of integrating the field equations by means of an inversetype procedure.engjournal articlehttp://dx.doi.org/10.1103/PhysRevLett.52.322http://journals.aps.orgopen access51-73PhysicsMultidisciplinaryFísica-Modelos matemáticosFísica matemática