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arXiv:1308.3332 [math.FA]AbstractReferencesReviewsResources

A decomposition theorem for positive maps, and the projection onto a spin factor

Erling Størmer

Published 2013-08-15, updated 2013-08-16Version 2

It is shown that each positive map between matrix algebras is the sum of a maximal decomposable map and an atomic map which is both optimal and co-optimal. The result is analyzed in detail for the positive projection onto a spin factor.

Comments: 12 pages
Categories: math.FA
Subjects: 46L99, 81P45
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