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arxiv: 1602.00021 · v4 · pith:X4CFTU36new · submitted 2016-01-29 · 🧮 math.OA

Decomposable approximations revisited

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keywords mapsapproximationasymptoticallychosenorder-zeroadditionalgebraalgebras
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Nuclear C*-algebras enjoy a number of approximation properties, most famously the completely positive approximation property. This was recently sharpened to arrange for the incoming maps to be sums of order-zero maps. We show that, in addition, the outgoing maps can be chosen to be asymptotically order-zero. Further these maps can be chosen to be asymptotically multiplicative if and only if the C*-algebra and all its traces are quasidiagonal.

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