Abstract
We completely determine the lattice structure for the faces of the convex cone of all positive linear maps between the 2×2 matrix algebras, in terms of pairs of subspaces of M 2.
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Byeon, ES., Kye, SH. Facial structures for positive linear maps in two-dimensional matrix algebra. Positivity 6, 369–380 (2002). https://doi.org/10.1023/A:1021397312586
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DOI: https://doi.org/10.1023/A:1021397312586