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Classes of projections in a von-Neumann algebra are studied, and thereby fairly general conditions for unitary implementation (of isomorphisms) are obtained. By introducing a relation between classes of projections we also get a unified proof and generalizations of some results in the spatial theory for von-Neumann algebras.doi:10.7146/math.scand.a-11424 fatcat:xhtqua77j5cbdnj5tff4hr3j4a