Second-order directional derivatives of
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S.J. Li; K.L. Teo; X.Q. Yang
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Article
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2005
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Elsevier Science
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English
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A spectral function of a symmetric matrix X is a function which depends only on the eigenvalues of X, A1 (X) ~ A2 (X) ~.-. > An (X), and may be written as .f(A1 (X), A2(X) ..... An (X)) for some symmetric function /. In this paper, we assume that / is a C 1,1 function and discuss second-order direct