Abstract Let A be an n × n Hermitian matrix and A = UΛUH be its spectral decomposition, where U is a unitary matrix of order n and Λ is a diagonal matrix. In this note we present the perturbation ...
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Vol. 218, No. 1134 (Jul. 7, 1953), pp. 345-370 (26 pages) Formulae are derived for the matrix elements of a ...
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