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math.OA1999
Orbits of conditional expectations
M. Argerami, D. Stojanoff
Let N \subseteq M be von Neumann algebras and E:M\to N a faithful normal conditional expectation. In this work it is shown that the similarity orbit S(E) of E by the natural action…
math.OA1999
Polar decomposition under perturbations of the scalar product
G. Corach, A. Maestripieri, D. Stojanoff
Let A be a unital C* algebra with involution * represented in a Hilbert space H, G the group of invertible elements of A, U the unitary group of A, G^s the set of invertible selfad…