On von Neumann algebras which are complemented subspaces of B(H)
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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.
10 pages, old amstex. Preprint Series Math. Inst. Univ. Copenhagen. 1992 no. 29
10 pages, old amstex. Preprint Series Math. Inst. Univ. Copenhagen. 1992 no. 29