Abstract:
For a von Neumann algebra with a cyclic and separating vector it will be shown that the von Neumann subalgebras with the same cyclic vector can uniquely be characterized by one-parametric operator-valued functions obeying a set of conditions. Since the properties contain no reference to the subalgebra these operator-valued functions will be called characteristic functions. On the set of characteristic functions there exists a natural topology under which this set is complete.
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Received: 3 December 1998 /Accepted: 15 February 1999
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Borchers, H. On the Embedding of von Neumann Subalgebras. Commun. Math. Phys. 205, 69–79 (1999). https://doi.org/10.1007/s002200050667
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DOI: https://doi.org/10.1007/s002200050667