Natural operations on holomorphic forms
  We prove that the only natural differential operations between holomorphic forms on a complex manifold are those obtained using linear combinations, the exterior product and the exterior differential. In order to accomplish this task we first develop the basics of the theory of natural holomorphic bundles over a fixed manifold, making explicit its Galoisian structure by proving a categorical equivalence {\it \`a la Galois}. 
Alberto Navarro, Jose Navarro, Carlos Tejero Prieto
math.CV math.DG