On the norms used in computing the structured singular value

Different norms are considered to replace the Euclidean norm in an algorithm given by M.H.K. Fan and A.L. Tits (ibid., vol.33, p.284-9, 1988), which is used for the computation of the structured singular value of any matrix. The algorithm is explained, and it is shown that the l/sub 1/ norm is the best possible norm in a certain sense.<
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