International Book Series of Mathematical Texts 2007; 356 pp; hardcover ISBN10: 9738789907 ISBN13: 9789738789906 List Price: US$58 Member Price: US$46.40 Order Code: THETA/10
 The volume is a careful selection of peerreviewed papers in operator theory, structured matrices, and dilations, dedicated to Tiberiu Constantinescu, a prominent mathematician in the field. The extensive survey of J. W. Helton and M. Putinar on positive polynomials, spectral theorem, and optimization is a pioneering essay that, under the unifying concept of positivity, brings together ideas from algebra, algebraic geometry, complex analysis, control theory, mathematical logic, and operator theory. The other research papers deal with recent advances in the following areas:  multivariable operator theory
 interpolation and moment problems
 perturbation theory
 composition operators
 matrix completion problems
 systems theory
A publication of the Theta Foundation. Distributed worldwide, except in Romania, by the AMS. Readership Graduate students and research mathematicians interested in analysis. Table of Contents  D. Alpay, R. W. Buursema, A. Dijksma, and H. Langer  The combined moment and interpolation problem for Nevanlinna functions
 D. Z. Arov and O. Staffans  State/signal linear timeinvariant systems theory, Part III: Transmission and impedance representations of discrete time systems
 M. Bakonyi and D. Timotin  The central completion of a positive block operator matrix
 J. A. Ball, V. Bolotnikov, and Q. Fang  Schurclass multipliers on the Fock space: de BrangesRovnyak reproducing kernel spaces and transferfunction realizations
 H. Bercovici and W. S. Li  Invariant subspaces with extremal structure for operators of class \(C_0\)
 A. K. Beros and D. Sarason  Composition operators and change of variable in one real dimension
 P. A. Cojuhari  On the spectrum of a class of block Jacobi matrices
 M. A. Dritschel and S. McCullough  Test functions, kernels, realizations and interpolation
 Y. Hachez and H. J. Woerdeman  The FischerFrobenius transformation and outer factorization
 S. Hassi, H. S. V. de Snoo, A. E. Sterk, and H. Winkler  Finitedimensional graph perturbations of selfadjoint SturmLiouville operators
 J. W. Helton and M. Putinar  Positive polynomials in scalar and matrix variables, the spectral theorem, and optimization
 G. Popescu  Von Neumann inequality on noncommutative domains
 J. Rovnyak and L. A. Sakhnovich  Interpolation problems for matrix integrodifferential operators with difference kernels and with a finite number of negative squares
 M. C. Tseng and V. Ramakrishna  Dilation theoretic parametrizations of positive matrices with applications to quantum information
