Michael A. Dritschel 
The Extended Field of Operator Theory 

As this volume demonstrates, at roughly 100 years of age operator theory remains a vibrant and exciting subject area with wide ranging applications. Many of the th papers found here expandon lectures givenat the 15 International Workshop on Operator Theory and Its Applications, held at the University of Newcastle upon th th Tyne from the 12 to the 16 of July 2004. The workshop was attended by close to 150 mathematicians from throughout the world, and is the ?rst IWOTA to be held in the UK. Talks ranged over such subjects as operator spaces and their – plications, invariant subspaces, Kre? ?n space operator theory and its applications, multivariate operator theory and operator model theory, applications of operator theory to function theory, systems theory including inverse scattering, structured matrices, and spectral theory of non-selfadjoint operators, including pseudodi?- ential and singular integral operators. These interests are re?ected in this volume. As with all of the IWOTA proceedings published by Birkh¨ auser Verlag, the – pers presented here have been refereed to the same high standards as those of the journal Integral Equations and Operator Theory. BANACH C* ALGEBRAS H CONTROL HILBERT KREIN OPERATOR THEORY INTERPOLATION VON NEUMANN A few words about the above image which graced the workshop programme and bag. In commuting between home in Hexham and work in Newcastle, I often x Editorial Preface travel by train.

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Inverse Scattering to Determine the Shape of a Vocal Tract.- Positivity and the Existence of Unitary Dilations of Commuting Contractions.- The Infinite-dimensional Continuous Time Kalman-Yakubovich-Popov Inequality.- From Toeplitz Eigenvalues through Green’s Kernels to Higher-order Wirtinger-Sobolev Inequalities.- The Method of Minimal Vectors Applied to Weighted Composition Operators.- The Continuous Analogue of the Resultant and Related Convolution Operators.- Split Algorithms for Centrosymmetric Toeplitz-plus-Hankel Matrices with Arbitrary Rank Profile.- Schmidt-Representation of Difference Quotient Operators.- Algebras of Singular Integral Operators with Piecewise Continuous Coefficients on Weighted Nakano Spaces.- Pseudodifferential Operators with Compound Slowly Oscillating Symbols.- Extension of Operator Lipschitz and Commutator Bounded Functions.- On the Kernel of Some One-dimensional Singular Integral Operators with Shift.- The Fredholm Property of Pseudodifferential Operators with Non-smooth Symbols on Modulation Spaces.- On Indefinite Cases of Operator Identities Which Arise in Interpolation Theory.- Singular Integral Operators in Weighted Spaces of Continuous Functions with Oscillating Continuity Moduli and Oscillating Weights.- Poly-Bergman Spaces and Two-dimensional Singular Integral Operators.- Weak Mixing Properties of Vector Sequences.