The paper proves an equivalence characterizing extreme points of tau-invariant UCP maps from a C*-algebra to B(H) in terms of Radon-Nikodym derivatives and faithful subspaces.
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Extreme points of unital completely positive maps invariant under partial action
The paper proves an equivalence characterizing extreme points of tau-invariant UCP maps from a C*-algebra to B(H) in terms of Radon-Nikodym derivatives and faithful subspaces.