2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36677An attempt is made of giving a self-contained introduction to holomorphic ideas in general relativity, following work over the last thirty years by several authors. The main topics are complex manifolds, spinor and twistor methods, heaven spaces.229 pages, plain TexGeneral Relativity and Quantum Cosmologytext