%0 Journal Article
%T A new proof of Donoghue's interpolation theorem
%A Yacin Ameur
%J Journal of Function Spaces and Applications
%D 2004
%I Hindawi Publishing Corporation
%R 10.1155/2004/814683
%X We give a new proof and new interpretation of Donoghue's interpolation theorem; for an intermediate Hilbert space H∗ to be exact interpolation with respect to a regular Hilbert couple H¯ it is necessary and sufficient that the norm in H∗ be representable in the form ‖f‖∗=(∫[0,∞](1
%U http://www.hindawi.com/journals/jfsa/2004/814683/abs/