2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/58283We discuss the twistor correspondence between complex vector bundles over a self-dual four-dimensional manifold and holomorphic bundles over its twistor space and describe the moduli space of self-dual Yang-Mills fields in terms of Cech and Dolbeault cohomology sets. The cohomological description provides the geometric interpretation of symmetries of the self-dual Yang-Mills equations.Invited talk at the EWM Workshop on Moduli Spaces in Mathematics and Physics, 2-3 July 1998, Oxford, to appear in the ProceedingsMathematical PhysicsHigh Energy Physics - TheoryExactly Solvable and Integrable Systemstext