Given two matrices A, B, we give an upper and a lower bound for the anti-distance sup⁡U∥A−U∗BU∥∞\sup_U \|A - U^*BU\|_\infty, where U runs over the set of unitary matrices.

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T. Ando

Hokusei Gakuen University, Faculty of Economics, Atsubetsu-ku, Sapporo 004, Japan

T. Ando. “Bounds for Anti-Distance.” Journal of Convex Analysis 3 (1996), No. 2, 371–373. https://doi.org/10.68381/jca03026