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Orthogonality to matrix subspaces, and a distance formula
Published in
Volume: 445
Pages: 280 - 288
We obtain a necessary and sufficient condition for a matrix A to be Birkhoff-James orthogonal to any subspace W of Mn(C). Using this we obtain an expression for the distance of A from any unital C*- subalgebra of Mn(C). © 2013 Elsevier Inc. All rights reserved.
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