Pointwise approximation by elementary complete contractions

Details Pointwise approximation by elementary complete contractions Pointwise approximation by elementary complete contractions

2009-02-02

arxiv.org/abs/0902.0277v1

Mathematics

Operator Algebras

11 pages, to appear in PAMS

Scientific paper

A complete contraction on a C*-algebra A, which preserves all closed two sided ideals J, can be approximated pointwise by elementary complete contractions if and only if the induced map on the tensor product of B with A/J is contractive for every C*-algebra B, ideal J in A and C*-tensor norm on the tensor product. A lifting obstruction for such an approximation is also obtained.

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