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Means of unitary operators, revisited

Mathematica Scandinavica (2007) 100(2) 193-197
DOI: 10.7146/math.scand.a-15021
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Abstract

It is proved that an operator with bound not exceeding (n - 2)n -1 in a C*-algebra is the mean of n unitay operators in that algebra.

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Haagerup, U., Kadison, R. V., & Pedersen, G. K. (2007). Means of unitary operators, revisited. Mathematica Scandinavica, 100(2), 193–197. https://doi.org/10.7146/math.scand.a-15021

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