CROSSED PRODUCTS OF VON NEUMANN ALGEBRAS

The paper is concerned with von Neumann algebras with finite trace and their -automorphisms, and with crossed products. A detailed investigation is made of the problem of constructing hyperfinite factors of type II1 by means of crossed products. Some new results are obtained on subfactors of hyperfinite factors of type II1 and also some new information on the trajectory theory of measure-preserving transformations.

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