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- W2023706405 abstract "A study is made of the extreme points of the convex set of doubly stochastic completely positive maps of the matrix algebra Mn. If n = 2 the extreme points are precisely the unitary maps, but if n ⩾ 3 there are nonunitary extreme points, examples of which are exhibited. A tilde operation is defined on the linear maps of Mn and used to give an elementary derivation of a result of Kummerer and Maassen." @default.
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- W2023706405 title "On Birkhoff's theorem for doubly stochastic completely positive maps of matrix algebras" @default.
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- W2023706405 doi "https://doi.org/10.1016/0024-3795(93)90274-r" @default.
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