This volume consists of eight papers on new advances in interpolation theory for matrix functions and completion theory for matrices and operators.Much emphasis is placed on different interpolation and completion problems when the interpolant is estimated in two different norms. The book also focusses on the study of the spectra of different completions of 2 x 2 block matrices when originally all entries are specified except the lower left corner. A third theme concerns two-sided tagential interpolation problems for real rational matrix functions, and also for the time varying case. A tangential moment problem is also analyzed.All papers deal with related problems of modern matrix analysis, operator theoy, complex analysis and system theory and will appeal to a wide group of mathematicians and engineers. The material can be used for advanced courses and seminars.
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