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The higher rank numerical range is convex
Journal article   Peer reviewed

The higher rank numerical range is convex

Hugo J. Woerdeman
Linear & multilinear algebra, v 56(1-2)
01 Jan 2008

Abstract

Convexity Higher rank numerical range Toeplitz-Hausdorff theorem
In this short note we provide the final step in showing that the higher rank numerical range is convex. The previous steps appear in the paper "Geometry of Higher-Rank Numerical Ranges" by Choi, M.-D., Giesinger, M., Holbrook, J.A. and Kribs, D.W.

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