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A NOTE ON POSITIVITY OF ELEMENTARY OPERATORS
Published online by Cambridge University Press: 01 March 2000
Abstract
We show that operators on n × n matrices which are representable in the form T(X) = [sum ][lscr ]i=1aiXbi (where ai and bi are n × n matrices) and are k-positive for k = [√[lscr ]] must be completely positive. As a consequence, elementary operators on a C*-algebra with minimal length [lscr ] which are k-positive for k = [√[lscr ]] must be completely positive.
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- © The London Mathematical Society 2000
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