Kristin A. Camenga

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a r t i c l e i n f o a b s t r a c t For a given n × n matrix A, let k(A) stand for the maximal number of orthonormal vectors x j such that the scalar products Ax j , x j lie on the boundary of the numerical range W (A). This number was recently introduced by Gau and Wu and we therefore call it the Gau–Wu number of the matrix A. We compute k(A) for two(More)
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