Article,

Enhancements to the von Neumann trace inequality

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Linear Algebra and its Applications, 428 (4): 738 - 741 (2008)
DOI: 10.1016/j.laa.2007.07.027

Abstract

Upper trace bounds for the product of two n-by-n complex matrices are presented. The real component of the trace inequality is tighter than von Neumann’s inequality, and the imaginary component is new.

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