Means of unitary operators, revisited Authors Uffe Haagerup Richard V. Kadison Gert K. Pedersen DOI: https://doi.org/10.7146/math.scand.a-15021 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. Downloads PDF Published 2007-06-01 Issue Vol. 100 No. 2 (2007) Section Articles
