Pairs of II1 factors
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A class of objects—that are best described as being actions ofgroup-like objects of von Neumann algebras—is axiomatised and it is shown that there exists a bijective correspondence between isomorphism classes of suchcovariant systems and isomorphism classes of pairs of II1 factors (M, N) satisfyingN⊂M, [M:N]<∞ andM∮N′=C.
Volume 133, 2023
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