For finite-dimensional Hilbert spaces, the C*-extreme points of contractive completely positive maps are exactly the P-C*-extreme points for projections P, giving a complete nested-direct-sum structure.
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$C^*$-extreme contractive completely positive maps
For finite-dimensional Hilbert spaces, the C*-extreme points of contractive completely positive maps are exactly the P-C*-extreme points for projections P, giving a complete nested-direct-sum structure.