Let be a separable infinite dimensional complex Hilbert space, and let denote the algebra of bounded linear operators on into itself. Let , be n-tuples of operators in . We define the elementary operator by In this paper we minimize the map , where , and we classify its critical points.
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Salah Mecheri, Another Version of Maher's Inequality. Z. Anal. Anwend. 23 (2004), no. 2, pp. 303–311DOI 10.4171/ZAA/1200