On von Neumann algebras which are complemented subspaces of B(H)
arXiv:funct-an/9212002
Abstract
If there exists a completely bounded projection of B(H) onto a von Neumann algebra M on H, then M is injective. If there exists a bounded projection and M is properly infinite, the same conclusion holds.
arXiv comment10 pages, old amstex. Preprint Series Math. Inst. Univ. Copenhagen. 1992 no. 29